Page 2 of 2 FirstFirst 12
Results 11 to 12 of 12

Thread: Air/Fuel Ratio Rising To 35% - Closed Loop Compensation 100%

  1. #11
    Join Date
    Dec 2009


    Start by replacing the fuel filters & fuel pressure regulator (LINK). Also, check that the fuel cell foam hasn't clogged the fuel pickup tube/filter.
    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.

  2. #12


    UPDATE: I installed the in-line fuel pressure gauge. I have 60 PSI during prime, then it drops to 20 PSI when the engine starts, then drops to 1-5 PSI while the truck runs. The idle is rough and the truck dies under throttle. I clamped the return line to check the regulator and there is no change in pressure, which leads me to believe the issue is somewhere between the tank and the Sniper unit. I replaced the pump and still having the same problem. Next step is to check voltage to the pump and check filters. My fuel cell doesn't have foam, so the pickup should not be clogged, but I'll check it and the filters.

    Well, I finally found the problem. The gasket sealing the gas cap disintegrated and got sucked into the pickup, which would also explain why I never saw any debris when I looked in the tank.

    Click image for larger version. 

Name:	IMG_1522[2].jpg 
Views:	41 
Size:	77.8 KB 
ID:	2196 Click image for larger version. 

Name:	IMG_1523[1].jpg 
Views:	50 
Size:	66.6 KB 
ID:	2197
    Last edited by 2B32; 05-15-2017 at 08:18 AM.

Page 2 of 2 FirstFirst 12

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
About us
Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR® Sprint® Cup team and nearly every NHRA® Pro–Stock champion for four decades. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. Holley's products also include performance fuel pumps, intake manifolds & engine dress–up products for street performance, race and marine applications. As a single solution, or partnered with products from other Holley companies - Hooker Headers, Flowtech Headers, NOS Nitrous, Weiand, Earl's Performance Plumbing, or Diablosport - Holley products can give you the edge you need over the competition.
Join us