High Fuel PSI

[Danny Cabral]

Contact Holley Tech Service (LINK) for a warranty replacement fuel pressure regulator. I'd first inspect the fuel pressure regulator (LINK) to ensure it isn't clogged with debris.

[Micribs]

Hey all. Just throwing in my 2 cents. I ran one supply feed, capped fuel return regulator on Sniper EFI and used the following filter/regulator: https://www.holley.com/products/fuel...s/parts/12-875 mounted by my gas tank. This way my return line is only a foot long, and don't have to deal with a long return line and potential issues with fuel regulator. Hope this helps!

[Danny Cabral]

Yeah, we discussed it HERE.

[stang70]

Just thought I would pipe in here. My car was running good just had some strange intermittent idle issues. I checked fuel pressure and found it at 95 psi. Called Holley, and they said they are having a lot of this issue lately, and told me they would have a new regulator in the mail to me today. He did ask me the color of the EFI body, so I'm not sure if I'm just getting a regulator kit or a cover also. I will update this post after I receive package. They did NOT ask me to email them a copy of my receipt, although I had it ready to send. I took delivery of my Sniper unit in Early March, not sure if that correlates with the other regulator issues I have read in the forum.

[351C Sniper]

So it seems advisable to have a fuel pressure test gauge. It's probably a good tool to have in the garage. A reasonably priced tool will pay for itself with just one use. On Summit there is a cheap: Actron Professional Fuel Pressure Tester Kit. Would this be acceptable? In the kit there is a dual manifold test adapter that clamps onto fuel hose. This gave me the idea that there must be a reliable Schrader fitting that can be permanently mounted on 3/8" fuel hose. I assume the fuel pressure can be tested just after the 10 micron fuel filter near the tank. I know the pressure gauge can be used under the hood, but then I'd have a gas mess under the Air-Gap manifold. I'm trying to build a well thought out fuel injection system that's easy to service without scratching my arms or spilling fuel.

[Zmann]

They sent me a new regulator cover with my new regulator, but that may be because I had mentioned a thread on here about the covers being an issue. The new cover is identical to the old cover AKAIK, but it did not include the rubber regulator tension button. And had no directions to transfer the old rubber part, but in my case I don't care, the regulator is no longer in my Sniper. I went with a divorced FPR setup.

[Rick90lx]

This is making me nervous. I'm installing a Sniper EFI system tomorrow and just installed a new Aeromotive 340 pump in the guy's tank today. He's not going to be happy if he has to buy an external FPR too.

[Gadget]

I used the Earl's -6 fuel pressure adapter, and put the Schrader adapter from my fuel pressure test set in it. I like to test as close to the throttle body as I can get, as this shows me the pressure the system is seeing. I have the in-tank Aeromotive 340 in my truck, and I found with the new regulator I had 90 psi, and when I pulled the screen off it I had 65 psi. So the screens won't flow enough, and are acting like a jet in the line driving the pressure up. So test the system when you put in on and if it is high, try removing pulling the screen. The fitting I use: https://www.summitracing.com/parts/e...FcOIswod-GMF5A. Jimmy

[Danny Cabral]

I've used this Earl's AT100199ERL adapter fitting and Earl's 100187ERL fuel gauge at the -6AN fuel feed line fitting. The black Earl's adapter fitting has an 1/8" NPT port, which will accept a gauge or a Schrader valve (Earl's 9616SVERL). The Tool Aid 33770/53770 Fuel Injection Pressure Tester uses the common -4 Schrader valve (1/4" flare). Nothing special about it, no fuel mess, and it works great. This Earl's 100189ERL fuel gauge can be used to check the return line pressure if necessary.

Don't confuse the two different types of Schrader valves:
1) An Earl's air tank/tire Schrader valve with a fuel resistant core (5/16"-32 UNEF, 1/16" NPT).
https://lmr.com/item/LRS-9321A/1986-...chraeder-Valve (1/16" NPT)
2) A fuel resistant -4 Schrader valve (1/4" flare) with 7/16"-20 threads (LINK/LINK).

[[email protected]]

I'm using the Holley drop in 450 LPH pump and have excessively high fuel pressure. Is that pump too big for the Sniper regulator?

UPDATE: I talked to tech support this morning. Guy knew exactly what I was talking about before I finished explaining it. I received my new cover & regulator this morning. 61 psi. WIN.

[351C Sniper]

Danny, that looks like a good Schrader valve solution. The -6AN Earl’s pressure gauge adapter and Earl's Schrader is a reliable, compact, low cost addition. And that Tool Aid 33770 Fuel Injection Pressure Tester looks like a good tool that may pay for itself many times over.

[Danny Cabral]

I've used this Earl's AT100199ERL adapter fitting and Earl's 100187ERL fuel gauge at the -6AN fuel feed line fitting. The black Earl's adapter fitting has an 1/8" NPT port, which will accept a gauge or a Schrader valve (Earl's 9616SVERL). The Tool Aid 33770/53770 Fuel Injection Pressure Tester uses the common -4 Schrader valve (1/4" flare). Nothing special about it, no fuel mess, and it works great. This Earl's 100189ERL fuel gauge can be used to check the return line pressure if necessary.

Don't confuse the two different types of Schrader valves:
1) An Earl's air tank/tire Schrader valve with a fuel resistant core (5/16"-32 UNEF, 1/16" NPT).
https://lmr.com/item/LRS-9321A/1986-...chraeder-Valve (1/16" NPT)
2) A fuel resistant -4 Schrader valve (1/4" flare) with 7/16"-20 threads (LINK/LINK).

And that Tool Aid 33770 Fuel Injection Pressure Tester looks like a good tool that may pay for itself many times over.

Yes, it does. I've owned the inexpensive Tool Aid 33770 for many years, and it's all that's needed with a -4 Schrader valve. There's a Tool Aid 33850 fuel test port adapter hose available (LINK - remains on tool, not vehicle), to keep the Earl's 9616SVERL Schrader valve installed in the Earl's AT100199ERL adapter fitting for the Tool Aid 33770/53770 Fuel Injection Pressure Tester. Or simply use the -4 Schrader valve instead (LINK/LINK); it's only slightly larger, so you won't need a tool adapter at all. Personally, I like the more robust -4 Schrader valve much better. Either way, it's not safe to have an actual fuel pressure gauge permanently mounted on the throttle body, due to engine vibration (possible failure, leak & fire); hence the benefit of a small permanently installed fuel Schrader valve. https://forums.holley.com/showthread...nts-amp-Clamps (Proper EFI Hose, Gasoline Sealants & EFI Clamps)

This is just a copy & paste of one of my other posts:

Originally Posted by Danny Cabral A loud fuel pump is usually an indication of fuel pump cavitation or maybe a clogged filter(s). Inspect/troubleshoot/service the fuel system (fuel pump, cavitation, plumbing, voltage, filters, pickup tube, tank venting, etc.). A datalog will just verify a problem with the fuel pressure, injector duty cycle, pulse width, etc. An EFI fuel system needs two filters: Before fuel pump - 100 micron pre-filter. (Or the OEM in-tank sock filter.) After fuel pump - 10 micron post-filter. (40 micron is for carburetion.) The 40 micron (carburetor) fuel filter has no place on an EFI fuel system. (I know you're not using it.) It's too "fine" of a filter to be used before the pump, causing fuel pump cavitation. FYI: The sock filter (HydraMat or OEM) of an in-tank fuel pump, is the pre-filter. Don't add another one. http://documents.holley.com/holleyfu...ems_chart1.pdf (Fuel System Selection Chart) http://documents.holley.com/flyer_ho...el_systems.pdf (Holley Fuel Systems Brochure) https://forums.holley.com/showthread...395#post223395 (Related Forum Thread - NAPA 20 Micron Pre-Filter) Contact Chris Myer at EFISystemPro.com. He's a Holley EFI parts professional, Holley EFI Dealer & fuel pump/fuel system specialist.