Holley Sniper Fuel Pressure Problems - How to Fix Them

How solve fuel pressure problem on the Holley Sniper System.
Do you have high fuel pressure? Causing your vehicle to run terrible?
Do you have low fuel pressure making your vehicle have little to no power.
We can fix this. And I'll show you how in this video.
Time Codes
00:00 Intro
00:53 The Problem
02:00 Fuel Pressure
02:31 Fuel Pump
02:39 Fuel Lines
03:08 Regulator
03:32 Regulator Screen
04:14 Powder Coat
05:13 How the Regulator Works
06:36 Regulator Problems
06:54 Low/High Fuel Pressure
07:48 Flushing the Unit
08:19 Test Fuel Pump Pressure
08:39 External Regualtor
09:09 External Regulator Plumbing
09:54 Boost Reference
10:46 Start up
11:13 Road Test
11:41 Recap
You'll learn,
How to find the problem.
How to check your fuel pressure.
How to test the fuel pump.
How to test the fuel lines.
Where the fuel regulator lives.
How to replace the fuel regulator.
How to add an adjustable fuel regulator.
What the regulator should be set at and how to set it.
Learn all this in less than 15 minutes.
Links to products in this video
Holley Sniper Fuel Pressure Regulator amzn.to/3RC8b3M
AEM Fuel Pressure Regulator amzn.to/3qg3wcc
Holley Sniper Fuel Pressure Gauge amzn.to/3et1eDJ
Gauge Adapter amzn.to/3erB0Bw
Thank you for tuning in.
Please Like & Subscribe
Comments and encouraged and appreciated
Thanks again,
Troy Kane
vtwinstov8s.com​
/ vtwinstov8s.com​
/ ​
/ troymkaneinc​

[@Charley_Buehner]

FINALLY someone puts out a Sniper video that doesn't have stupid music interjected everywhere at 3x normalized volume -- THANK you!

[@troykane]

Glad I could help.

[@mudsling454]

i installed mine and primed the pump and it was pushing 100 psi so i done the same thing you done . i still havent drove it yet cause the rest of truck isnt done but glad it works thanks

[@rosinsautofab1956]

Great video thanks

[@wetpossum]

This is a really helpful video, my sniper has been running for about 18 months with no issue but now it appears I've got a low fuel pressure issue, as the AFR leans out to 20+ and the CL comp jumps all the way up from 1% to 50%. Fuel filters are clean and lines are not restricted so this is my next place to look.

[@heathhenderson7217]

This video helps a ton… thank you

[@stevec1746]

Those regulators cause a lot of problems. Holley dropped that feature on the Sniper 2. But the new in-tank one-outlet fuel modules have exactly the same little regulator in the tank.

[@chrisphillips5682]

Dude thank you so much for this video, I had metal chrome flakes in mine and a bunch of junk on the screen. I’m gonna put it back on and hopefully I’m back in business. Thank you either way!

[@chrisphillips5682]

And we’re back to normal operation!!!! I owe you big time!

[@jeffreyrue4569]

Love this video!!

[@matthewortega7580]

This may help. Thank you soooooo much!!!

[@troykane]

Glad I could help

[@68maro13]

So glad I came across this video!! New Sniper installed and tuned by Henson Racing (so I know its right). New aeromotive fuel system with intank pump, inline 10micron filter. Last 3 out of 5 drives she acts like she's running out of gas and dies. Now she never does this (or at least hasn't yet) on the highway, only on city streets. 1st time big backfire (sounded like thru the carb) then sputtered and died. let her sit 2-3 mins fired right up. Next time, just sputtered along and died. Tried to start her up right away and no go. let her sit a min or two and fires right up and drives fine. same on the third time she's done this. I'm gonna run a data log on my next outing and see what I find. At least I know some thing s to start with. Thanks again for the video!

[@troykane]

Good Luck

[@RJGPG]

1) Truck is badass and sounds good. 2) I believe this is my issue. I also have a black powder coated unit and ever since first startup it didn't want to take fuel well and have to rev slowly. Erratic fuel pressure at time. I have opted for the holley filter/regulator setup (corvette filter style with 58 bypass) just with 6AN fittings. I really hope this does the trick. Also, can't remember if I checked back of unit for vac caps on booster port, ran to intake.

[@troykane]

Good luck, thanks for the comment

[@ronskopitz2360]

I have had consistent high pressure (~69 psi) on my Sniper 2300 since I installed it. I pulled the regulator diaphragm and cleaned the screen, etc. Plus, it makes this godawful whine/squeal when priming and sometimes when running, which Holley says is “regrettable, but normal”. Came here wondering if it would work to pull the diaphragm and go with an external regulator, so THANK YOU for posting this!!!

[@troykane]

Yes I would try an external regulator. Remove the internal one first. Good Luck

[@ronskopitz2360]

@@troykane external regulator ordered! this is for a cammed, bored, and stroked Chevy 2.8L (now a .030 over 3.1). Been getting 6 MPG!! Measured AFR is reading a full point higher than what’s in the table, and Holley thinks it’s overfueling due to excessive pressure. We’ll see! Looks like even the 2-bbl, 2-injector 2300 is too big for my 194 cu inches of fury!! 😂 Thanks again for the info!!!

[@johnc.wunscheljr2873]

Thanks put the reg on the return works great.

[@troykane]

Glad I could help

[@goyesinv]

Buen video, tengo problemas de caída de presión cuando aceleró el vehículo

[@troykane]

Left side is the inlet. (drivers side). Thr right side has a round cover for the fuel pressure regulator.

[@jgvford]

i have a real good question . Which side of the holly Sniper is the feed and which side is the return ?

[@allenoliver1907]

Great video! Are you blocking the return on the throttle body. Then using the bottom port on the external regulator for the return? I’m running the in-line pump that comes with the Holley sniper kit. Thanks.

[@troykane]

Coming off the return on the throttle body to the regulator. From the regulator to the tank.

[@buzzdog70]

My fuel pressure is down to 20 psi, my VE numbers are going way up into the 200s at WOT. I checked and it’s low, time to remove it and use an external regulator.

[@samperras]

I had the same issue

[@stanmorton8975]

Sometimes I question choosing efi over carb..Really isn't plug and play. It's a lot of trial and error.

[@troykane]

I agree!

[@gregbrooks1138]

I just tried putting the Sniper on my 66' GTO after having the engine rebuilt. I used an internal fuel pump with the new fuel tank. I have great pressure at the tank but only getting about 5 PSI at the Sniper. I am miffed at this point. Blew out the fuel lines and did every thing I could think of. I finally put the old carb on there so I could go to Cruise the Coast in Biloxi. I've talked to Holley experts about 3 times and they blame the fuel pump, the fuel pump experts tell me the line is blocked. I will worry about after the I have my fun at CTC.

[@troykane]

Are you running an in line fuel filter between the pump and the tank? That could be the problem. If not try to cap the return line and see what you have for pressure. Is your in tank fuel pump regulated? A few things to check. Hope this helps.

[@cminteriorcustoms3652]

I do have a in-line fuel filter why would that be the problem?

[@frankosauto]

@@cminteriorcustoms3652 I think he's suggesting if that filter was clogged it could be the problem or a problem!

[@frankosauto]

Great video... My problem is it wont hold the pressure once primed! So I hit the key, it primes up to 60 psi then goes to 20 so then when I crank it, it won't start! just crank crank cranks. If I go to the return side at the firewall mounted regulator and kink the hose it will build 100 psi and start.... then I unkink the hose! at this point runs and perfect fuel pressure.... Tried another regulator and same issue!

[@troykane]

Have you tried to adjust the regulator?

[@frankosauto]

@@troykane Yes Sir I have... fuel pump in a Tanks Inc Tank up to the filter then up to reg. then out of reg to sniper unit on rear drivers port. return off bottom of reg. and rear passenger is capped.... also inspected screen was clear since not used I left it out!

[@troykane]

Ok, this is my set up. From the in tank holley pump. To the inline fuel filter. From the inline filter to the drivers side rear of the sniper, with a pressure gauge installed at the inlet. I removed the Holley regulator from the throttle body on the passengers side. Connected my return line from the sniper return to the boost regulator. Then from the boost regulator back to the tank return line. The vacuum line on the regulator goes to manifold vacuum. Then adjust your fuel pressure at the remote regulator. This works for me me. It should work for you. Good Luck.

[@mopster1913]

Do you see a problem with not running a return line with the sniper 2 with a returnless edelbrock sump pump? I will be putting turbo on and figured the boost reference internal regulator on edelbrock sump pump would take care of everything. ..?

[@troykane]

Yes I do. My own experience with a boosted vehicle, is you need a return line. The reason is the pump with the built in bypass cannot react quickly enough to the fuel demands of a boosted engine. So use the same pump (I did) and install a boost reference regualator to the return side and run a return fuel line. You'll be amazed at the difference in performance. Good Luck

[@mikefarrell2333]

On the regulator, with that AN adaptor (Edelbrock Russell 670343 Fuel Pressure Take Off), that line goes back to the fuel take - so you essentially converted it from a RETURNLESS to a RETURN system?

[@troykane]

Exactly! You got it.

[@derekhogle6186]

I also had the same issue. Only it was my fault, it was before I put the proper fuel filter on. The screen inside of the pressure regulator clogged up. Mine also got damaged after removal, so I suggest having a backup on hand.

[@troykane]

Good idea! Also keep an oxygen sensor on hand too!

[@Dragooadventuretales]

I have a Sniper on a 1976 Toyota FJ-40 with 2F motor. It runs great but requires time for fuel pressure to build at every startup. It it possible to add a check valve and accumulator to refuse the time required to start? Thanks.

[@troykane]

I have never done that. I would think it is possible. let me know if you do it. I'm curious

[@Dragooadventuretales]

@@troykane thanks for the response. I may do some research.

[@pipelinesalvatoregiordano4954]

What linkage did you run on the holly the factory is a 1to 1 ratio for the secondary. Or there is a progressive linkage out that. I just saw came across your first install of this set up and was wondering why you didn't run a return then?

[@troykane]

I'm running stock linkage. I had plumb no return because of Holley said I wouldn't need one with the In Tank Pump. However, to run the Boost Reference Regulator I had to go to a return line system.

[@pipelinesalvatoregiordano4954]

Ah I wasn't under the impression that any Holly set up would be return less only the Fi tech fuel set up can be cus of there surge pump.set up

[@troykane]

It got me thinking that too

[@TheEvilTwinCG2]

I have a question. I have a turbocharge 98 Honda accord, engine is fresh rebuilt, same as turbo kit. After 300 miles my cheap Amazon fuel pressure sensor gave up on me. Is it still safe to drive on small road for errands as long as I stay under boost? The new sensor won’t be here until the weekend. Fuel pressure was set at 50psi but I’m only getting 27.5+- psi. The cel will pop up if I go above 3500rpm. Car starts up normal, idles normal, and drives normal under boost.

[@troykane]

I would buy a quality part. And wait for it to be delivered. An improper fuel mixture in a new engine can equal big trouble and lost $$$$

[@babyboydreyden]

So my question is . I have the Holley stealth sniper 4150 and it sounds like it’s pulsating in the exhaust as I punch on the throttle . It’ll go away for a bit at a nice drive then it’s back at low rpm

[@troykane]

That I have not heard of. I would check your fuel pressure before, during and after to see if that may be the problem. Good Luck

[@johnc.wunscheljr2873]

I put my adjustable fuel regulator before the sniper. It works . I still have the diaphragm in it. should I remove it??. I had problems with it from the start . Holley said they were back ordered and did not know when the part would be available. thanks Holley you know this part is bad. Should I put the regulator on the return side like you did?

[@troykane]

Remove the diaphram (regulator) and place the external regulator on the return side. With the factory regulator in the throttle body, it's limiting the adjustability of the external regulator.

[@johnc.wunscheljr2873]

By moving the adjustable regulator to the return side will that set the psi to 58 returning to the tank and 58 psi to the inlet also? I have 2 tanks and the valve to switch tanks is like the one on my f250. Some times the return dose not switch and it will over fill the back tank. I hope by lowering the return side it will make the switch work right. I had problems with the sniper at first it would backfire. I was getting false spark from wires crossed. It was solved by bending the gray wire in a uturn and twisting it and the false spark quit . There was no video at the time to go by . I wish I had watched yours great idea keeping it separate like you did . Thankyou for the help your videos are great. John Wunschel Placerville ca aka Old Hangtown ca @@troykane

[@dmsava]

I would like to try this external regulator set up. I'm NOT running a boosted engine. What would be the brand and part number of the regulator I would need?

[@troykane]

Aeroflow or Holley. Get one without the boost control

[@mikeydejon2148]

I bought 85 corvette with Holley sniper efi. Person I bought it from says they never changed the fuel pump in tank. It did have tune port injection I find those run around 38 to 42 psi. I ordered a 100 psi fuel pump. My car dies out on light acceleration. If I stop to fast it’ll kinda choke out and die. So I’m hoping this is case just not enough pressure. Any input would be appreciated nice video

[@mikeydejon2148]

Also when I put to floor at idle my air/fuel goes up to 19 I figured that’s pretty lean

[@troykane]

Sniper need 58-62 psi. I would start there.

[@lynnh7694]

Your running two fuel pressure regulators? One in the tank and one on the back of the Sniper unit. Is that standard?

[@troykane]

No it just happened that way. I thought the tank regulator would be responsive enough, but it was not. So I added the boost reference regulator.

[@roberthansen6392]

Not sure if im having a fuel or ignition issue but my problem is When i drive for a few minutes my air to fuel ratio is around 13 to 14 then goes straight to 35 and dies and i cant start it for like 30 min then it will fire right back up and drive for another 5 to 10 min and repeat any ideas?

[@troykane]

So it's going lean. You need to find out why. Are you getting ample fuel supply? Is the fuel supply continuous and steady. That what i would check first.

[@dennisreavis4687]

Send to Steve Marshall Jr

[@cminteriorcustoms3652]

Hello I love your videos I have a sniper unit also am I am boosted is there anyway that I can talk to you on the phone for help

[@borocamo]

I wish my car ran like that with my sniper. If I dump my throttle I get a backfire at the throttle body and I've gone through 2 incline fuel pumps that seem to run much louder than they should

[@troykane]

Sounds like a timing issue to me. Are you using timing control?

[@borocamo]

@Troy Kane Vtwins to v8s I'm running an msd ignition. The shop that installed my efi went out of business so I doubt he did anything more than the initial set up

[@troykane]

@@borocamo You have to check the timing. I would recomend timing control by the Sniper makes for such a better system.

[@herbgoodw9421]

Hi everyone, I am having a similar problem with my Sniper unit. My Sniper unit has less than 500 miles on it. My car ran fine for a couple of months. Since then, it's been really acting weird. In a nutshell, my car idles fine up to about 170 degrees on the Sniper handheld. The fuel pressure is good around 60PSI. Then all of a sudden, it drops to around 25PSI and stalls. I can't get it cranked up for days. I checked the Sniper regulator screen and it actually looks clean. Anyone have any ideas on this? Is there a way to actually test the fuel pressure regulator? Thanks.

[@troykane]

Check the coolant temp sensor. Make sure it's reading the correct temp. This will have an effect on how the system works.

[@Rick-Williams59]

I can tell you this, Holley external fuel pump that came with my Sniper was shit, left me on the side of I-40, got another, left me down again, so the 3rd time I got the in-tank pump with the internal regulator on the pump. Now I really don't trust it to go out of town. When it runs, it's excellent. I really don't want to go back to the quadrajet, but if I can't find a fuel pump that I can trust I will have no alterative. Again, real loud, Holley fuel pumps suck. I'm open to suggestions on a fuel pump brand that is trustworthy that will feed my Sniper.

[@troykane]

Holley's in tank fuel pump is good. Link amzn.to/3Rv5LUN Some guys swear by Walbro Fuel pumps Link amzn.to/3RuVRCX

[@Moparbarnett88]

I'm having same issue, when I install the external regulator where do I connect the boost reference line if I'm not running boost, my victor Jr intake does not have a port that small

[@troykane]

You do not need to connect the reference port. Just set the regulator and you are done.

[@Moparbarnett88]

@Troy Kane Vtwins to v8s Thank you, do I need to cap it off?

[@troykane]

@@Moparbarnett88 It wouldn't hurt. But you don't have to.

[@Moparbarnett88]

Hey so I put the regulator on but it doing same thing, fuel pressure won't go down.

[@troykane]

@@Moparbarnett88 Did you remove the regulator from the Holley throttle body? Take that out first. Then you can adjust the remote regulator.

[@cminteriorcustoms3652]

Hey, I would really like for you to work on my vehicle. Would that be possible?

[@petermartinez4886]

Was this Sniper 1 or Sniper 2?

[@troykane]

Sniper 1

[@cminteriorcustoms3652]

The person that was working on my car is no longer available and I was having issues similar to work was on this video Just seeing if I can contact you via telephone

[@troykane]

Sorry my friend. I just don't have that kind of time. The guy you are looking for is Nick Langdon. Madscience Motorsports. He can build you a custom tune and diagnose just about anything fuel injection related. Good luck tell him Troy sent you.

[@jonettemendenhall9269]

I have the sniper on a 454 Chevy and it is just dumping fuel. I have a mechanic friend he looked in the carbonator and yells shut it off shut it off. So much gas in to the sniper he thought it was water he said no it's definitely gas. Lol I'm a female so nobody listens to me.

[@troykane]

Is your vehicle fuel injected or does it have a carburetor?