Gasoline Leak? Easy DIY Nylon Fuel Line Repair

Here's how to fix a gasoline leak from a nylon (plastic) automobile fuel line, using Dorman fuel line repair kit and press-fit unions. This is an easy DIY fix, and doesn't take very long. Please be careful working around gasoline! Thanks for watching Buckwsr, helping you put the "Do" in the Do-It-Yourself!
Get your Dorman 800-059 repair kit here: amzn.to/2H3zX7F
Get your Dorman 800-191 press-fit connectors (5/16") here: amzn.to/33cWND2
Get your Dorman 800-193 press-fit connectors (3/8") here: amzn.to/2YJ3Rrz

[@brentwalden]

Thanks so much!! I ran over a stick that popped up and broke my fuel line. Tried a few different things that didn't work. I'd never heard of these fittings before. You saved me a lot of time and money!!

[@pontiacsrule8761]

I like how you showed the actual DIY mistakes & fixes. I said to myself I would put wire loom on that EGR valve. Then you did it in the end, great job.

[@TheShadeTreeFixitMan]

Thanks for the demonstration, including the slight misstep. Keeping it real.

[@Buckwsr]

Thank you, Sir.

[@thewagonadreambylewis]

Thank you so much; brought/installed the connector kit and the nylon press fittings today because of your video; very helpful. I was afraid to “cut” my cars original part at first. Your vid gave me some courage. So far so good; no leakage.

[@Buckwsr]

Cool. Mine are still working perfectly, too.

[@danpaytas9662]

@@Buckwsr wow 2 years and it’s still holding up? Nice !!!

[@jameswhite1319]

Thanks I going to do it today

[@scotttaylor8811]

How did it go?@@jameswhite1319

[@chicagocrazy5740]

I’m gonna try this! My driveshaft fell off and broke my fuel nylon line. This seems like a lifesaver and $$ saver

[@rich_budekproject_demo5573]

Great video. Glad it held up for you. Me personally, I don't trust the push on because it's only an o-ring holding the seal. Dorman has compression union #800-226 for 5/16 line that has brass on the inside of the tube, and nut with seal on the outside. You can then adjust the compression depending on how tight you tighten the compression nut. It's only a bit more work but it just feels safer. And as it ages if it does leak, you can always snug it up more. Also, as others have stated, I don't think sanding should ever be done on the outside of the tube as that is where the seal is made on the tubing with the press on. Being OCD, I go one step further and even use a razor to cut the line to make sure there are no burrs on the lip of the cut that could interfere with the seal. Thanks for your video.

[@danpaytas9662]

Thank you man. My 93 Buick has a leak just like that but right before the fuel filter. Just ordered this!!

[@leecasteel9211]

How'd it hold up?

[@TechsHelpingHand]

I found your video quite useful. Thank you for spending the time and effort to present this affordable solution to us

[@Buckwsr]

Thanks so much!

[@charlie6869]

I've watched a lot of videos very informative thank you

[@mikezolinski18]

Thank you. I like your detail and easy pace.

[@Buckwsr]

Thanks so much!

[@Pontes-ART]

Great help thank you very much... I have a similar situation, and I was finding difficult to believe that the connectors would hold the fuel pressure, now thanks to your video I trust it’ll do the trick for me as well. Liked the video to help with the algorithms 😉👍

[@Buckwsr]

Thanks, Andre. I did this repair job a year and a half ago, and it has held up perfectly!

[@Superfandangoo]

Data sheet is 10 bar /145psi on these push fittings

[@noname-xc9ye]

Thanks for the info I see it works and it work for me too

[@5150streetsoklahoma]

I have a bonneville with nylon fuel line and repaired it with a union but it is leaking so im going to have to put a new union on i guess. But good video and great info !

[@jameswhite1319]

Thanks for sharing awesome video it makes more sense than any other of the 30 video I have looked at fixing my 2005 Cadillac Deville that has a leaking gas fittings

[@Buckwsr]

Thank you so much!

[@mgysgte.castillo3440]

Hey James, looks like I missed a question from you, some time ago. Yes, this worked on my 1996 Cadillac. I used the Dorman brand found at almost any auto parts location and was pleasantly surprised at the ease of installation, as well as its effectiveness.

[@joserosas5420]

Thank you so much for providing excellent content. Your video gave me the confidence to repair my own fuel line on my 2000 Pontiac Bonneville 3.8L I used the exact same part numbers. The only difference I did was take a heat gun to curve the hose as close to the stock one. Other than that it was a nice clean repair. Not sure if I'm able to upload a picture of the repair. If I can I will.

[@Buckwsr]

Great note! Thanks for watching and commenting. Good job on the repair!

[@keonkelley2324]

Great help

[@JesusofNazerth]

You taught me a lot

[@johnjay336]

Nice job!

[@RedPillLife1966]

On my 2001 Buick Lesabre I had a leak in 90 degree fitting. Under the back seat there is a fuse panel. 2 Fuel pump fuses are in there. I pulled those out and started car till it died. It helped relieve the fuel pressure and saved me getting fuel all over the place.

[@Buckwsr]

Thanks, John!

[@piederbeeli6351]

"keep it up! I love it!"

[@markmckinney9821]

Genius product by dorman.

[@roseymalino9855]

I agree with your several assessments: a) not to use the barb fitting; b) not to squeeze / cut; c) not to induce a kink in the curve. That line can withstand under hood temps and will take a set first hot / cool cycle. You could have used hot water or a heated wet towel to soften / shape the line to avoid kinking and eliminate any stress strain on the connectors.

[@Buckwsr]

Thanks for watching and commenting.

[@mobilecommunicationsnetwor5268]

Just checked the GM shop manual. Back 3/8 line is Feed. Front 5/16 is return.

[@dontblameme6328]

Correct.

[@fredrickvoncold]

I put one near the gas tank on a 93 ranger .I I had to take the bed off to fix it .I just hope it holds up ,they make me nervous that they might start leaking.

[@Ereezyy]

Thank you my friend life saver

[@larrygomer]

I use a heat gun to warm up the tubing . You can put it in shape you need to .

[@nickw8071]

Other chaps use a hairdryer to warm up the tube so you can shape it

[@pedrodawn]

Nice video! Are these the same as pneumatic fittings? Do you size the connector up or down, or just buy 3/8 connector for 3/8 nylon line? Thank you!

[@joedarden2276]

Well Done

[@Superfandangoo]

Thanks for sharing info and video. Thinking of using one of these push on or it’s £150 part and 5hrs fiddly fitting. Checking data sheet 10bar pressure which is good but worried about the 60c heat as under the bonnet (hood) gets to 80c on a LR TDV6 diesel, how has it held up?

[@Buckwsr]

The repair job I did with these fuel line connectors has held up perfectly, as I drive this car every day. It's been about a year and a half, I think, since I did the repair.

[@toddisbound2luvu]

Thank you very much for the awesome video, I am going to be using the same exact things that you used, but, I was wondering what you did when the fuel was leaking through the connections, to make it stop leaking? and how is this holding up? I have fuel leaking in my engine, and my service engine light is on, saying that it is running to lean, and has a vacuum leak.

[@Buckwsr]

Repair is holding up just fine. I resolved the leak by making sure both ends of the tubing were fully inserted into the union. Also twisted the coupler a bit to verify all was as it should be. That's it really.

[@toddisbound2luvu]

@@Buckwsr Thank you very much for your quick reply. I am going to have to use a pair of scissors to cut the pipe with since I don't have a saw or the cutting pliers. before you fixed this were you getting any service engine light codes coming on?

[@Buckwsr]

@@toddisbound2luvu It was the odor of gasoline, not the SES light, that tipped me off to the fuel leak. Your lean condition trouble code could be due to a wide variety of potential issues, fuel pressure being one of them. But the fuel leak repair is your top priority right now.

[@johnathanleapheart6390]

😅😅😅😅😅😅😅😅l😅😅😅😅😅😅😅😅😅😅😅😊😊😅😅lll

[@barrybrake6325]

I'm going to try it on a Chevy hhr.. I really hoping 🙏it would use I

[@pierrejohnson6264]

Thanks

[@TheGeorgenc40]

'l don't like that crimp in the the line so I'm going to cut it out with these side cutting pliers.. (earlier) I don't want to use side cutting pliers bc it will squeeze the line' LOL

[@HandyTim]

I've got a leak that keeps coming back and came across the repair joints and watched your video thanks. I'm just going to eliminate the connection and install one joint

[@Buckwsr]

Thanks, Tim. Hope you get it solved.

[@blaingunter]

Did this end up working for you in the long run, Tim?

[@Berkner80]

Will this work on hard rubber motorcycle 1/4 in. Fuel line?

[@barrybrake6325]

Hey how did you get that fitting to stop leaking

[@mauriciocornejo1905]

did you only used the puh union only..............? or did you used the new fuel line hose and cut it?

[@charlesfrandolig5090]

Might try to bend the new line using a heat gun and a coil spring type tubing bender as used for thin walled copper tubing in household water supply lines and refrigeration lines. Worst thing that could happen is you might melt the shit. A judicious application of heat and bending will probably get you through. You're not going to get a 90 using this method. But you could do a loop. Nonetheless, thank you for the video, It gave me some ideas.

[@leesbassment6393]

Those sharkbite connectors are pretty cool. Used in plumbing, air, and now fuel. I bet that leak was because you sanded the end of that tube. Hopefully she holds for you.

[@Buckwsr]

Thanks, Lee. The job has held up for well over a year now, no problems.

[@ronaldjacobs8561]

a heat gun on the low setting will work to soften the line just enough to bend it without stressing the walls. then let it cool.

[@anorsegoddess9797]

Yeah not smart to do on a fuel line

[@ShadowDancer6990]

I need this

[@mikegold4454]

Great video, I only have one comment, and that’s get it away from the EGR valve that gets hot as hell. Not looking to be negative just an observation.

[@Buckwsr]

You are right, of course. But I insulated the line well where it passes by the EGR. It's been over a year, driving this car daily, and still working perfectly.

[@mobilecommunicationsnetwor5268]

How did you determine the fuel line was the feed and the other line was to return?

[@Buckwsr]

I believe it is the line that runs to the fuel pressure regulator there on the front corner of the engine that is the feed line....not that it makes any difference....the line that is cracked is the one to repair, right?

[@foundinscriptureorg]

Just a little even better if deal. It be better if you put some rubberized tape on the bend where it’s makes contact with the metal.

[@nos1000100]

Ive had luck with steel lines with those unions too

[@stripecatflippangitnamecha8721]

Is your still doing good? I have leak in the middle under my car, Steel line got pin hole

[@nos1000100]

@@stripecatflippangitnamecha8721 its holding but i do plan on replacing it. Its not rated for steel or aluminum lines. Since i have done work to the truck. I need a bigger fuel pump so i may go with AN lines

[@guestguide2544]

You cut plastic nylon fuel line with razor cutter very quick and easy with a sawing with pressure motion.

[@pierrerenaud311]

Didn't have much luck with them .Seemed like a great idea at the time but they would leak a little then stop then leak again said the heck with it and went and got the brass couplers. So far much more secure connections.

[@Buckwsr]

Yes, I have used the brass compression fittings with success in the past. But these press-fit unions have held up perfectly for me...and it's been a year and a half since I did this repair. Thanks for watching the video!

[@jameswhite1319]

Thanks

[@ProctorSilex]

Those unions do not fit the 3/8 line on my 1988 F150 (too small). The 10mm fit but do not seal.

[@mohamedgamaleldien4216]

hi sir; does it survived without leak under engine heat and fuel pressure.

[@Buckwsr]

The fittings have held up perfectly for a long time now, without any problem.

[@franciesruber6881]

I like the connection grips, where can i purchase this,

[@Buckwsr]

you can get them at any auto parts store or amazon

[@Bigbacon]

how long did this last?

[@microfarmers]

Also use silicone lube for the shark bites.

[@stripecatflippangitnamecha8721]

Can I use this in fuel line the metal part? Mine is leaking under my car.

[@Buckwsr]

No. These are for nylon (plastic) fuel line only. There are brass compression fittings that can be used to repair the metal fuel lines.

[@jonstechchannel]

@@Buckwsr is there a nylon to metal compression fitting?

[@allanshane807]

Can you use the end of the union on a steel line

[@Buckwsr]

These fittings are for nylon (plastic) fuel line. You can get brass compression fittings to use on steel fuel lines.

[@allanshane807]

Thanks

[@chachifeere]

You can also use a brass union rib fitting and heat the plastic tub and twist the fitting on. Then you can hook up you rubber fuel hose the that fit

[@edwardparker6195]

These Dorman quick connect fittings look like a pretty good solution to a similar problem I have on my 96 Cadillac Deville. Do you trust them for use on the high-pressure line feed line?

[@Buckwsr]

I think they're fine for either, supply or return.

[@mgysgte.castillo3440]

Hey @@Buckwsr! Thanks for this video. Though simple, it gave me the confidence to attempt a fuel line repair. Yes, this worked on my 1996 Cadillac and I did use the Dorman brand found at almost any auto parts location. I was pleasantly surprised at the ease of installation, as well as its effectiveness. More than a year and no issues.👍

[@vonstew3314]

would you recommend this for a metal fuel line ?

[@Rana285ful]

It's works too

[@reeco355]

Any idea of the diameter of the pipe in mm?

[@aviee4560]

This is 8mm which is mostly uses in fuel line And that connector have many sizes like 10mm 8mm 6mm 4mm 12mm 16mm and more And you can confirm your fuel pipe size by normal scale

[@RealInsaneGalvatron]

I have a 96 Camaro with a leak in the nylon fuel line. It says "not repairable" on it. Does that mean I can't utilize this technique?

[@michael1294]

Same question. My return near the tank is leaking due to a rodent. It does say not repairable but I suspect that is for liability. Anyone know?

[@bryanr5756]

any leaks with that union?

[@Buckwsr]

5 months later and still holding just fine, no leaks.

[@markwhitfield5412]

why u got 2 inline connectors on one pipe, u could of took the one on the engine spun it round to join the one on the inner wing.

[@lesliemarable6046]

What are those connector called

[@Buckwsr]

see link in the description

[@demerclopez2622]

is it still working?

[@Buckwsr]

yes, runs great. my daily drive.

[@msdecemberloveangel8236]

My son did the same thing here what u did but its still leak around where the connectors are joined. He did to connection but only one leaks. Can anyone give suggestions please thanks.

[@Buckwsr]

If you (or your son) read through the comments on this video, you might get some ideas on how to prevent or eliminate leaks. I did this video maybe a year ago, and it has held up well with no leaking. Good luck.

[@msdecemberloveangel8236]

@@Buckwsr Thank u fo ur video knowledge is Power. Ur video helped my son to fix his vehicle. He used the metal connectors tjey worked much better. That saved him 400.00

[@Buckwsr]

I congratulate your son on getting the job done himself. I, too, have used the brass compression connectors on other projects, with much success.

[@barrybrake6325]

@@Buckwsr hey how did you get that union to stop leaking I'm in bad need of something like this

[@Randellpride]

How did this work out if u don't mind

[@Buckwsr]

These fittings have never leaked on me. So it worked out great.

[@jortcheese1254]

when presser goes in the line it would have got that kink out over time or use a heat gun on low setting ...never put more butt connectors in then you need to ...i would rather have a little kink then putting another one of those in

[@billburchfield8425]

I installed one of these and it leaked. A real pain to remove.

[@thewagonadreambylewis]

Ps: your wire insulation to me; is a good idea

[@masterofnonetv8361]

Did those connectors ever leak?

[@Buckwsr]

Nope. never.

[@MattJonesYT]

Steel on steel contact with anything in the engine bay even with a hand hacksaw can make small sparks. It would be safer to cut the line with snips.

[@Buckwsr]

steel on steel? You mean steel on plastic....it's nylon fuel line, not steel.

[@hippitymcstribbs4906]

Liked the video thanks. But he's right, the hacksaw could have slipped through cut into metal elsewhere.. and someone could even make an accidental connection berween a hot wire and grounded material, however unlikely. Prolly even wise magic to disconnect the battery but maybe thats overkill idk. Though the later happened to me once, dropped a wrench on an engine and the other end managed to land on the alternator hot post, which should have had a cap on it

[@jeffreydevoti7000]

If they make those repair couplings in 90° , could have used two with straight pipe in between.

[@Buckwsr]

I'm pretty sure they make 90 degree fittings, but I was trying to make it work with what I had on hand.... Still holding up well to this day, happily.

[@jeffreydevoti7000]

@@Buckwsr Had to fix fuel filter fitting that developed a hole on Crown Vic. 90° quick connect fitting, about 6" 5/16 rubber fuel injection hose, two clamps and new Motorcraft fuel filter. About $30 and hour or so and back in business.

[@tru4life947]

👍🏽

[@heavyflippingrandmasboifir669]

Dude I’m doing this to my ‘96 Caprice Monday....

[@Buckwsr]

Hope it goes well. Read the comments on this video for some helpful tips left by other viewers. Good luck.

[@LSp8]

My 96 Impala SS just started leaking horribly today. Right at the rear next to the driver's trailering arm. Can't even tell which line it is due to so much leakage everywhere.

[@hwyy9046]

Did it work?

[@hwyy9046]

@@Buckwsr I have a 96 caprice as well leaking from my fuel return line right above the fuel filter it’s a nylon hose would it be safe to use these undercarriage?

[@heavyflippingrandmasboifir669]

Thanks brother it did work and I bought a couple more just to have on hand.

[@keithbailey5923]

3/8s feed 5/16s return

[@Buckwsr]

Excellent. Thanks for the clarification.

[@davidjohnson-iw6vj]

Rubber fuel hose and 2 clamps would have did it for me, not a big deal in fixing that.

[@danrodrigues3531]

I bought these for my car and they absolutely suck. They wouldn't grip the tubing and I just threw them away out of disgust. Use a compression connector that is specified for nylon and you will have better results.

[@Buckwsr]

Worked flawlessly for me.... Compression connectors work well, too, I will say. Thanks.

[@microfarmers]

Please don't use a hacksaw, it only takes dust size pieces to clog your injectors.

[@Buckwsr]

Good tip. Thanks.

[@clarktferrill]

Bad choice of words..( OK LETS 🔥 FIRE IT UP )

[@Buckwsr]

Ha ha! Yeah, you're right. Well, the good news is that it's still running great. (and no fires!)

[@fredkuhn165]

Use pex tubing cutters

[@Buckwsr]

thank you for the tip!

[@subcool1762]

These fitting are garbage! Dont use! Use the brass fittings with the small plastic gasket

[@Buckwsr]

I, too, have used the brass fittings successfully on some other projects.

[@barrybrake6325]

So they make them with a plastic gasket brass union has a brass flare won't work

[@barrybrake6325]

@@Buckwsr it's got a brass union on it now that leaks

[@ericphelps5043]

Wouldn't recommend, I tried two different fittings both leaked

[@dontblameme6328]

Ouch... You doubled your chance for failure by using two unions instead of one. And running the line around the EGR valve is a recipe for disaster. There is a good reason the OEM routing was outside the heat shield. A piece of wire loom is no substitute for a heat shield.

[@Buckwsr]

Ouch nothing. The repair job has held up great. But if anything does go wrong, I'm blaming you.

[@moonpiespotlight4759]

PTC fittings for fuel - bad idea.

[@Buckwsr]

Once again, I mention that these fittings are designed and marketed specifically for fuel line repair....

[@roymurdock9815]

That push lock is for airlines. I wouldn't recommend using that to splice fuel lines. If you must half ass it like this use a brass compression fitting that doesn't have a chance of leaking under low pressure like this fittings used that are designed to be most affective over 60psi.

[@Buckwsr]

These fittings are designed and marketed specifically for fuel line repair.

[@roymurdock9815]

Ok, learned something new. Thanks for the video.

[@ryanchenier-poulin8570]

@@Buckwsr I replaced the entire car with these fuel lines hopefully it won't leak

[@barrybrake6325]

I out can't use brass union on plastic lines