have a 2001 gt with a s/c but since i had it tune i have a problem with fuel pressure .when you first the car the pressure is about 30psi but after a little the fuel pressure drops to 15psi and 5 or below i changed several fuel pumps ,fuel pressure regulator and had the car retune and the problem continues can any body give me a ideal what to do next because i dont what else to do any help please thankx
were the fuel pumps burned out or were they still working? you could always look into a kenne bell boost a pump as well. (that is if you are not getting enough pressure)
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Procharged 2002 Mustang GT 5 Speed 351rwhp 353rwtq at 10psi
Next summer looking to go with:
Bilstien shocks + struts, Lowering springs (brand still TBD (any suggestions?)), MM CC plates, front + rear sway bars, subframes, and upper and lower control arms.
Time to make the pony ride some rails
ok first off what all have you done to the car? that looks like an eaton m112 cobra supercharger. did u get the kit from torque tech to make that work on your gt or is that a eaton m90? what size injectors are u using? basicaly what all have u done to your car, the more we know the better we all could help u
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K&N cai, steeda udp, 75mm pp throttle body, pp matching plenum, 30lb injectors, pp typhon intake, patriot state 2 heads, comp stage 2 cams, arp headstuds, bbk long tubes, bbk off road x-pipe, flomaster exhaust, spec sage 2 clutch, eibach pro street coilovers, MM caster camber plates, qa1 tubular k-member and a-arms, FRPP 4.10s, saleen black chrome rims, nitto 555's, corbeau Lg1 racing seats, 5 point harness, sct livewire, nexus gauges, MGW short throw shifter, probably forgetting a few...
Procharged 2002 Mustang GT 5 Speed 351rwhp 353rwtq at 10psi
Next summer looking to go with:
Bilstien shocks + struts, Lowering springs (brand still TBD (any suggestions?)), MM CC plates, front + rear sway bars, subframes, and upper and lower control arms.
Time to make the pony ride some rails
The Walpro 255 is a return style pump isn't it?
Make sure you are buying a returnless fuel system fuel pump. If you install a return style pump it will do what you are seeing.
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"Ignore that whistle, it's just a vacuum leak."
2000 Mustang GT:
Saleen Series IV Twin Screw, Chicane I/C, AFCO Extreme H/E, 2.8" pulley, FMS 42# injectors, Dual Catted 2 1/2" UPR X Pipe, UPR LCAs/UCAs, 2 1/2" Flowmaster American Thunder kit, 90mm LMAF, 112" Goodyear Gatorback, Kenne Bell BAP, Mosaleen idler, T-56, Detroit TrueTrac w/ 373s, Demolet 100mm CAI, SCT XCal2 with JDM Engineering 93 Octane "Race" tune.
If the shop specializes in mostly 99up Mustangs, they should know this about not using a Return style pump in a returnless system, but some speed shops still make this mistake, it might not hurt to ask.
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"Ignore that whistle, it's just a vacuum leak."
2000 Mustang GT:
Saleen Series IV Twin Screw, Chicane I/C, AFCO Extreme H/E, 2.8" pulley, FMS 42# injectors, Dual Catted 2 1/2" UPR X Pipe, UPR LCAs/UCAs, 2 1/2" Flowmaster American Thunder kit, 90mm LMAF, 112" Goodyear Gatorback, Kenne Bell BAP, Mosaleen idler, T-56, Detroit TrueTrac w/ 373s, Demolet 100mm CAI, SCT XCal2 with JDM Engineering 93 Octane "Race" tune.
fuel pressure problem 
