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Thread: Fuel pressure is at 90 psi - Sniper or fuel pump?

  1. #1

    Default Fuel pressure is at 90 psi - Sniper or fuel pump?

    Hi! I'm on my second Sniper and 5th WBO2 sensor (over the last 2 years), but I just put 5K pretty trouble-free miles commuting on it with Closed Loop disabled. (I was able to get a pretty good fuel tune before my 4th WBO2 sensor went bad.)

    Yesterday, I decided to put on the 5th WBO2 sensor and re-enable Closed Loop to get it self-tuning again, as I wanted to take it to a dyno for a proper tune, but I looked at my fuel pressure gauge on the hose right before the Sniper, and it's at 90 psi in stead of sixty. Now, I don't know how long it's been at 90 psi, it could have been for the last 6 months of driving and didn't notice it. I do have a little whine coming from the fuel pump, would it be worth it to swap that out first to see if that fixes the fuel pressure? Or should I just have the Sniper serviced?

  2. #2
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    Electric fuel pumps only produce volume, the fuel pressure regulator sets the desired pressure. Replace the fuel pressure regulator (LINK).
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  3. #3

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    Thanks Danny! Nice that it's serviceable, but it's backordered for a bit. Is this a generic GM part I can find elsewhere?

  4. #4

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    You can always cap off the internal regulator and use an external regulator. The Corvette regulator/filter combo is inexpensive and fits in the main fuel line. Of course, if you're system is already plumbed and you're happy with then just wait for the Holley internal regulator to show up. http://www.tanksinc.com/index.cfm/pa...rod/prd425.htm

  5. #5

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    I usually agree with Andy, but not on this one. Inexpensive (go ahead, you can say cheap) is what started the problem. I believe that GM setup uses a similar preset regulator.
    I suggest a quality adjustable bypass regulator like the Aeromotive. NOT cheap, for sure.

  6. #6
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    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  7. #7

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    Quote Originally Posted by Flatlander View Post
    I usually agree with Andy, but not on this one. Inexpensive (go ahead, you can say cheap) is what started the problem. I believe that GM setup uses a similar preset regulator.
    I suggest a quality adjustable bypass regulator like the Aeromotive. NOT cheap, for sure.
    Inexpensive doesn't mean cheap quality. GM buys parts in very high volume which allows the manufacturer to make parts for a lot less money. If you buy OEM quality replacement parts, then they'll have the same reliability as the parts the GM puts on new cars. GM probably only pays a few dollars each for those Corvette regulators, but they last for a long time on new cars.

  8. #8
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    Quote Originally Posted by andyf View Post
    If you buy OEM quality replacement parts, then they'll have the same reliability as the parts the GM puts on new cars.
    I agree with Andy, but I like the adjustable fuel pressure regulators (bypass/return style) better. With a big fuel pump, the OEM filter regulator can become a flow/volume problem: https://aeromotiveinc.com/frequently...fi-regulators/ (Aeromotive EFI Fuel Pressure Regulator FAQs - Read Question #8.) Holley EFI actually makes excellent fuel pressure regulators.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  9. #9

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    So I took out the regulator while I wait the month for the backordered Sniper replacement one. Theres really not much to them? What goes bad on these?

  10. #10

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    I've worked on a bunch of Sniper installs now and only had one bad fuel regulator. The one bad one I saw was deformed in the middle. Not sure how it got that way, but it appeared to have been crushed somehow. That Sniper was bad and had to be replaced, since it didn't work correctly even after the regulator was replaced. The Sniper seemed to have a bad injector based on the way it ran. So perhaps that Sniper had gotten dropped on the floor back at the factory and the wiring was knocked loose and the regulator was damaged? We just sent it back and got a replacement. These days I keep a spare fuel regulator in my tool box.

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