Fuel Tank Vent Size, So important! How to do it right - Tech Tip Tuesday!

In this Tech Tip Tuesday, Doug talks fuel tank venting.
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[@toddclark332]

I know you guys do it right love what you share with us buddy thanks have a fantastic day

[@johnm7265]

Wow y'alls last few tech tip videos including this one are the exact questions I've been trying to find answers to! Thank

[@ldnwholesale8552]

Tank vent,, use a brake booster one way valve. Plenty large and do not spill either. I have used them for 40 years on road race cars as well as speedway with no issue. IF you want to be doubly sure use some 3/8 hose in a spiral. Bulletproof

[@ramirogarcia1045]

So just a regular one way brake booster valve should work for a universal ebay 20 gallon fuel cell?

[@harmankardon478]

good idea!

[@Rags2Wrenches]

Love these videos make this build so much easier!!

[@JohnRoberts71]

Great content thanks for sharing, very informative

[@johnwitte551]

awesome tech talk

[@KCadbyRacing]

Great video guys👍

[@AndyGeesGarage]

Excellent info

[@mobes329]

Good info.

[@young11984]

Be nice to see a fuel cooler kit for the returning fuel or stand alone low pressure pump/cooler circulator maybe with a fan to cool fuel in the tank while on high temp days, may not be a big call for one but A/A intercooler cars dont have an ice tank to use as a return fuel cooler

[@kaseyfranks7495]

Love Tech Tip Tuesday, I'd like to see one maybe on diptubes for the return side into the fuel cell for guys using external pumps, (i.e A1000) like size, how to fab one, etc. Not alot of info out there on them.

[@shanemcmillion2618]

Thank you

[@jerrybaldwin7543]

I use to watch some of y'alls videos more then half but now that Cleetus got involved i support everything y'all do and it's all made in the USA HELL YEAH BROTHER LET'S GO 💯 💪 😎

[@MotionRaceworksOfficial]

Thanks Jerry!

[@donnienorris6094]

Thx!

[@Rea-per]

Hell yeah brother

[@kanadianken5673]

Love your info Doug - by any chance is a microphone setup in the works for your videos ? Sometimes hard to hear you clear and your info is so good a don’t wanna miss anything.

[@MotionRaceworksOfficial]

Typically I try to mic up but forgot and made and chad edited this video this morning lol

[@revredbeard3289]

That was a very polite way to address the audio issue. I was thinking the same thing. 😁

[@kanadianken5673]

@@MotionRaceworksOfficial right on - thank you. Keep crushing it Motion !!!!!!

[@gregorholmes1837]

On my twin turbo rig. I run a full evap system. Works great

[@theislandbug1254]

Explain? How it work and what is controlling it

[@gregorholmes1837]

@@theislandbug1254 JFM ask ford how the eco's work. ha

[@SloppyMechanics]

i feel like a big reason people do not get their intended fuel flow for pumps etc is because of improper ventilation

[@lazyhoundracing9621]

Great, thanks for the info. I need a complete duel system for my I6 Chevy 292 with 6-71 blower and duel quads. About 1000 hp. I'll be giving you a call.

[@sowbellymotorsports9783]

Do you have pictures/videos of your project? That sounds really cool and I'm very intrigued!!!

[@lazyhoundracing9621]

@@sowbellymotorsports9783 I'm not sure how to do that. It's a work in progress. I'm waiting on the machine shop to fit the head and dowel the mains and girdle it. Then Hogan can make the intake. Billet crank, cam (solid roller) and rods by Crower. Ryan Falconer V-12 aluminum head (crossflow 340I 220E). 5 stage dry sump. Electromotive coil over direct fire T200s ignition. I'll try to figure out how to send pics. It goes in my 53 Chevy 1/2 ton pickup.

[@sowbellymotorsports9783]

@@lazyhoundracing9621 That sounds like a really cool project for sure. I really like off the beaten path and that for sure is!

[@KrGsMrNKusinagi0]

Honestly on highe pressure yes but on low pressure no.. had a 62 SS impala with a big block and literally had no vent system but i had to fill it up so often the pressure was released every time

[@ba.skidderLOCKDOWN]

I use a ball-bearing breather/anti roll valve

[@budlightner6658]

Try to prepare for an L.S swap in my 95 step side Choo Choo custom what fuel pump should I use to get started with. What's the best breather to us for your fuel cell. Thank

[@raydrew3]

It’s been 12 an to the pump 10 an to the regulator and 8 an on the return for thirty years it hasn’t changed👍

[@tomanycooks]

it's Wednesday here in Australia, do these tips still work on a Wednesday?

[@kaseyfranks7495]

🤣🤣🤣🤣🤣

[@Sharkey_t]

you might have more of an issue with the them being upside down than the day of the week

[@johnterpack3940]

You have to run a week behind. So watch this next Tuesday.

[@buenos_dias]

In a drag racing application Where in the tank should the vent be located?

[@brandongreene3213]

Is that what happened to El Toro when Derek and John were on RMRW? The vent wasnt big enough? Or was the issue with the ambient air being 1000000 degrees.

[@lonnyself3920]

good day I hope

[@wittracing72davidwitt74]

This may knot be in your wheel house but I have a question . If you have 40 psi going out to a injector how much suction pressure do you have? I have my vent line looped about 6 times. I doing this because of off road racing and don't want the fuel splash out of the vent but I think my vent line is sucking shut

[@jonhill9564]

Don't understand why this channel doesn't have a million subs. Maybe your new partner could help with that? I don't race, or have a cool car, but find all these videos interesting. 👍

[@genemounce8302]

I put a Summit Racing plastic cell in the back of an old C10 I built years back. Came out one HOT summer Texas afternoon and the vent had failed. Cell was swole up like a 2 day old dead hog on the side of the road. Took a pair of big ass channel locks to get the plastic cap off just to release the pressure.

[@smartins.]

Anyone got some input on my idea? I can't find anything when searching for it. I'm thinking about running dual vents one on each side of the tank, Would it be a good idea a bad idea or just overkill? My thinking is if fuel splashes up in the vent line and up on the check valve closing it on one side of the tank in a hard turn for example then the other side would vent just fine and vice versa, The more ventilation the better? Second question not as important right now: Is there a good type of pressure clock that you can install in the gas tank to keep an eye on how much pressure is in the tank just an extra safety feature that I'm thinking on. cant be too safe when dealing with custom built tanks for flammable liquids right? And what should the pressure be inside of a gas tank? As close to atmosphere as possible or is there some sciensy thing I don't know to having the right amount of pressure in a tank?

[@sportster350]

Do water to air intercooler next please!

[@scottbennett3548]

I second this…I’d like to know other than AN lines what hose works best for the water lines because AN starts to get expensive

[@D-WAKE]

@@scottbennett3548 You can use a barb style fitting and use almost any type of hose. Just need to make sure its water safe and you aren't using it over the recommended operating temp. The larger diameter hose the better.

[@scottbennett3548]

@@D-WAKE what kind of water pump? I know the Davies Craig is what everybody uses but how does everybody mount them? Also what fittings is everyone using to mount fuel filters straight to the pump? I’ve looked for -10 ORB to -10 ORB fittings and can’t find any lol

[@D-WAKE]

@@scottbennett3548 you can mount a CD pump by using the inlet threads. Just thread it onto the ice box. Or make a mount that bolts to the rear on the pump. Lots of places sell -10 orb to -10 orb, in a pinch you can just use a normal AN male to male and just put o rings on it.

[@scottbennett3548]

@@D-WAKE cool thanks man 👍🏼

[@marc3311]

You said that a "check valve" was not mandatory. Pretty sure NHRA requires a rollover valve on all fuel cell to prevent fuel from coming out if vehicle is upside down. Having a catch can will not prevent the fuel from coming out of the cell. A protect check/rollover is required and should be used for safety. Also, a very good idea to have a filter on the vent or it will suck a LOT of dirt in the fuel cell and fuel system.

[@gregmckinney6977]

Just curious. I was always told to install 2 vent lines the same size as your feed line, with appropriate size check valves, one of the front and one on the rear, stagger their sides too. That way if drag racing, the rear vent closes off, but the front is open. Same for the side to side which does the same with a full tank and street driving.

[@jinalshah3841]

I have handicapped van. I notice I have custom made fuel tank with dimension of 26 x 30 x 6. How can I find this dimension tank? I can’t find it and I can’t drive due to fuel leaks

[@johnterpack3940]

I like that you cover odd topics like this.

[@MotionRaceworksOfficial]

Thanks John! Any suggestions for future videos?

[@johnterpack3940]

@@MotionRaceworksOfficial I'll think about it. I don't race, so not really sure if the things I'm curious about would be relevant to your channel. I'm just planning a 5-600 HP hotrod. It will be more pro-touring than drag.

[@prdctofxprienc]

When I call you better be available Mr Doug

[@mattg7952]

Dougie when are you guys going to design a setup to route fuel line through an ice box to help keep the fuel from boiling on drives? Think a simple coil type heat exchanger would make a difference if you have to buy ice and water to cool the tank itself.

[@Justme-jt1ef]

I wonder why this hasn’t been done yet??

[@buddyhirshfield5970]

@@Justme-jt1efa fuel pump controller is a better fix

[@Justme-jt1ef]

@@buddyhirshfield5970 I had to look this one up seems like it would work but I also think a cooler would be a good idea as well maybe use the factory air-conditioning instead of ice cubes and when you race take the belt off or just use an Electric A/C pump of a sort.

[@young11984]

@@buddyhirshfield5970 controller does great for fuel alone but doesn’t help control ambient temp or road surface temps radiating under the car

[@bovineknievel410]

There are plenty of companies that make these. Just search fuel cool can.

[@DONT_SLE3P]

We need a blazer update

[@MotionRaceworksOfficial]

Fixing to get back on that bad boy very soon!

[@jaredspear8140]

Question Doug. We have a carbureted 69’ Nova with a bbc. We run E85 and do not have a return line. Do we need to add a return line? right at 425 RWHP with 8AN line going thru a Holley fuel pump. Don’t remember the size/volume but when I did the math for our carb last year it seemed to be enough. Only running about 9psi on the system. Thanks for the info

[@johnterpack3940]

Other than the extra expense, there's no downside to running a return system. And it can help the pump live longer. No reason not to run one if you can afford the extra plumbing.

[@jaredspear8140]

@@johnterpack3940 appreciate the info. Still fairly new and learning new things all the time. I’ll definitely get one in while reassembling the car. Sounds like it can never hurt!

[@johnterpack3940]

@@jaredspear8140 glad to help. I don't have a PhD myself. But cars are actually pretty simple to understand when you break it down. And they haven't changed as much in the 40+ years I've been playing with them as some folks would like to think.

[@jonhill9564]

Support 🇺🇲

[@0hertzs]

I've just put a in tank phantom system in my truck, but I can't fill tank up , gas stops quickly😔

[@danielsullivan9865]

Wouldn't it be building vacuum instead of pressure which the vacuum would help the return line instead of hinder it would put more amps/ stress on the pump though.

[@Sharkey_t]

you have to also think about fuel heating. fuel is going to the hot engine bay, through fuel rails bolted to a hot engine, and then returned to the tank. also consider on a race week car the air temps increasing throughout the day. this alone will cause a lot of pressure build up in the tank.

[@peterscandlyn]

What about Derek's foxy Mustang? Didn't it die with fuel dilemma early on, if so who's fuel system was it running?

[@MotionRaceworksOfficial]

Internal wiring short on the fuel pump, not a system design issue

[@peterscandlyn]

@@MotionRaceworksOfficial Thanks for the clarification, cheers.

[@eddean6663]

Is there anything you can do that keep fuel from boiling? I know a few people on RMRW had problems including Cleetus had this problem.

[@jordantrujillo293]

I figure there has to be a way the manufactures accomplish that. Maybe something we could duplicate?

[@MotionRaceworksOfficial]

A cooler similar to a transmission cooler works

[@briancroneberger9243]

@@MotionRaceworksOfficial something I've heard of to keep the temp down is on a few raceweek cars is a "small" drop in pump to do normal driving/crusing like a 450, as well as a larger external pump that kicks on when needed. Not sure exactly what criteria triggers that from the ecu, is this something you've heard of and is known to work?

[@paullutherborrow637]

Iv been itching to see what’s going on with the blazer

[@scotfrey426]

By looping the vent line, you could get fuel trapped in the bottom of the loop, thus it will act like the trap on your sink... not allowing it to vent. Do not loop...

[@johnmosetti545]

correct we loop ours for the marine world and we have water and condensation that does the samething per what you are saying.

[@luckydiwana1196]

Where about this?

[@dannywilson8021]

restriction will cause heat

[@chandannel]

Didn't you have to replace a fuel pump on El Toro?

[@MotionRaceworksOfficial]

Yes, but it was from an internal wiring issue where the coating came off the wiring and grounded on the housing, nothing plumbing wise

[@donaldbingham8990]

I think you gave some incorrect information when you tried to relate fuel flow from the tank to high and low pressure pumps. The higher pressure for EFI is needed for the injectors to atomize the fuel whereas the low pressure pump for a carburator only has to keep the carb fuel bowl full but if the engines are making the same HP they will use the same amount of fuel. It is still science and not magic. You can pull a gallon/hour of fuel from the tank at 10psi or at 60psi and the fuel flow rate is still the same (1 gallon/hour).

[@ooigfgnnkhjjnc]

Didnt explain how to make the vent.

[@censored1360]

Lets all request the math and science lol jk jk

[@joshuajames9005]

Wish y’all sold that fuel cell.

[@MrLangleylad]

I seem to recall el Toro having some fuel pump issues , what’s going on here ? lol 😂

[@MotionRaceworksOfficial]

That was a fuel pump internal wiring issue, not system design problem

[@larrycleeton]

Please invest in a wireless microphone.

[@frankensteincreations4740]

Spiral up your vent line… No clue who started that, but it’s not a 💯 thought through idea… Ever heard of a sink trap? If fuel gets up in the spirals and sits, you now have a blocked vent line. One that now pushes that “fuel pill” back and forth through the vent line… It’s now effectively an expansion chamber not a vent line. Is it a total fail? No, but it’s not 💯… A proper vent fitting with a check ball and a hose attached, if someone properly engineered one, is the ultimate solution. No clue why in 2024 the aftermarket is so slow…

[@Wouldpkr]

when are you guys going to start getting serious about your tank safety and use ATL fuel bladders in your tanks?

[@Wouldpkr]

also, my friend makes fuel tank vents, you should probably just use his. instagram.com/p/CPyxqqHDVas

[@angry408w7]

@@Wouldpkr his vents are big $$$ and not e85 compatible.

[@kevinwest3689]

As a new guy to swapping an LS and hopping it up. And the way I Currently have it set up. You just saved me more then what it's going to cost to do it right. Before it fails or gives me troubles. 🫵🤘🇺🇲