Hey I installed the Shelby non supercharged gauge pod my 2007 Shelby GT. The pressure is now reading 20 - 40 lbs and the car is starting to miss. I think at one point it used to hit 70lbs. It now has 11,000 miles. Anyone know what the fuel pressure normally should be when I floor the gas pedal. That is when is misses the most. Thanks guys.
1
fuel pressure ?
Started by
Stanger_merged
, Apr 10 2012 02:51 PM
3 replies to this topic
#1 OFFLINE
Stanger_merged
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Posted 10 April 2012 - 02:51 PM
#2 OFFLINE
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Posted 11 April 2012 - 08:56 AM
I have the GT500 dual-fuel pump on my SGT with supercharger. Pressure usually around 40 lbs at idle, but under hard acceleration it jumps to 60-80 lbs.
Have you changed your fuel filter? I change mine every 10K miles.
Also, bad spark plug and or spark plug coil can cause misfires - are you getting any check engine lights/codes?
Sam
Have you changed your fuel filter? I change mine every 10K miles.
Also, bad spark plug and or spark plug coil can cause misfires - are you getting any check engine lights/codes?
Sam
Edited by 2007_Shelby_GT, 11 April 2012 - 08:58 AM.
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Posted 11 April 2012 - 09:11 AM
Stanger_merged, on 10 April 2012 - 02:51 PM, said:
Hey I installed the Shelby non supercharged gauge pod my 2007 Shelby GT. The pressure is now reading 20 - 40 lbs and the car is starting to miss. I think at one point it used to hit 70lbs. It now has 11,000 miles. Anyone know what the fuel pressure normally should be when I floor the gas pedal. That is when is misses the most. Thanks guys.
A Port Injected EFI/PFI system is a High Pressure system and runs up to as much as 100psi.
If you used to see 70psi and you're only seeing 40psi now...You have a problem.
Like the other poster said, check your fuel filter first. If you can't blow through it, it's bad. Replace it and see if your FP comes back. If you can blow through it, it's not RESTRICTED (although it may still be "bad", as in dirty).
If it's not your filter, it's most likely a fuel pump problem or fuel pump supply (voltage) problem.
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CURRENT MODS: FRPP: Whipple 2.9L Polished Superchager w/Crusher Inlet & Cobra Jet dual 65mm Throttle Body - Ceramic Coated Shorty Headers - Ford Blue Cam Covers - Polished Billet COP & Oil filler cap covers - FR3 Handling Pack w/Tokico Struts/Shocks & Eibach Swaybars - Jounce Bumpers - 8.8" Low Profile Axle Girdle - 3" Front Brake Cooling Ducts - Vacuum/Boost Gauge~ MGW:Short Throw Shifter~ PST: 1-piece Carbon Fiber Driveshaft~ Revan Racing: C&R Radiator and Intercooler~ ROUSH: 3x Intercooler degas bottle - Side Splitters - Extreme Off-road exhaust - Adjustable Trailing Arms (LCA) - Adjustable 3rd Link (UCA) - Adjustable 3rd Link Bracket - AC Vent Pod Vac/Boost Gauge Mount~ SHELBY: SC Aux. Idler pulley - Oil Dipstick handle, MC, PS & WS Washer reservoir caps - 8-qt. Oil Pan - Subframe K-member - Tubular Front A-arms - 6S Extreme Front Brakes - KR Style Front Brake Duct Bezels - Anti bump-stear tie-rod ends - Race Style Swaybar Links - Adjustable Caster/Camber Plates - Adjustable Panhard Bar - Panhard Bar/Body Brace - KR Rear Axle Reservoir - Eradispeed Rear Brake Rotors & Caliper Relocation Brackets - 18" GT500KR Alcoa Dura-Bright Wheels & Goodyear KR Winged Boot F1 Supercar tires~
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Posted 11 April 2012 - 11:15 AM
My SGT came with the gauge pod and the fuel pressure sending unit failed early on. It was reading like yours at first. I had a Ford tech tell me if it was too low it would throw a code or likely not run at all. I've heard of others failing also so I doubt I'll ever really trust what it reads unfortunately.
I would try the fuel filter first since it's relatively cheap and easy.
I would try the fuel filter first since it's relatively cheap and easy.
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