Fuel Pressure Question

Eagle2000GT · October 9th, 2007, 08:06 PM

Is the fuel pressure on our Mustangs regulated by the computer?

I had a fuel pressure gage installed when they installed the supercharger and new fuel pump. In my mind the gage behaves oddly. I would have thought that pressure would read the highest when there was no demand for fuel and that pressure would drop off a little at WOT. That doesn't happen. At idle it reads a little over 30 psi. As you open the throttle, fuel pressure increases. At WOT its over 40 psi. Back off to cruising speed (70 mph) and the fuel pressure drops back to 35 psi. Is this normal?

GTsetGO · October 9th, 2007, 09:29 PM

that's pretty much how mine operates.

MATT02GT · October 10th, 2007, 11:16 AM

Yea I hate how the electric guages read. Not too accurate in my mind, but I guess as long as there is some psi all the the time.

sonicblue · October 10th, 2007, 02:10 PM

yes that is perfectly normal in these cars

jivepepper · October 10th, 2007, 05:47 PM

Just as long as it goes up when your wot. The harder you work the injector the more Fp is needed. I see over 50 sometimes.

October 9th, 2007, 08:06 PM	#1
Eagle2000GT I Post Entirely Way Too Much 2000 Mustang GT 12.73@111.36 Join Date: Aug 2007 Location: Shelbyville, IN Posts: 5,311 iTrader: 1 reviews	Fuel Pressure Question Is the fuel pressure on our Mustangs regulated by the computer? I had a fuel pressure gage installed when they installed the supercharger and new fuel pump. In my mind the gage behaves oddly. I would have thought that pressure would read the highest when there was no demand for fuel and that pressure would drop off a little at WOT. That doesn't happen. At idle it reads a little over 30 psi. As you open the throttle, fuel pressure increases. At WOT its over 40 psi. Back off to cruising speed (70 mph) and the fuel pressure drops back to 35 psi. Is this normal? __________________ ProCharger P-1SC, 9 psi, STD 396/383; Uncorrected 388/375; SAE 383/370 Mods list in Garage.

October 9th, 2007, 09:29 PM	#2
GTsetGO Cigar Assassin 2004 Mustang GT 12.88 @ 112 Join Date: Aug 2005 Location: A Galaxy Far, Far Away Posts: 14,083 iTrader: 10 reviews	that's pretty much how mine operates. __________________ Cigar Samplers for Sale 2008 Acura TL-S - 2008 Honda Pilot EX-SE - 2008 Cain F Big Bear Paradox

October 10th, 2007, 11:16 AM	#3
MATT02GT The Mean Green Join Date: May 2007 Location: Colo. Springs, CO Posts: 4,164 iTrader: 1 reviews	Yea I hate how the electric guages read. Not too accurate in my mind, but I guess as long as there is some psi all the the time. __________________ Its not how fast you drive, but how you drive fast. 2002 Mustang GT... Just The Usual Bolt-Ons Bolt on list in Garage..

October 10th, 2007, 02:10 PM	#4
sonicblue Hardcore Enthusiast 1990 GT Join Date: Aug 2006 Location: dalzell, south carolina Posts: 1,436 iTrader: 0 reviews	yes that is perfectly normal in these cars __________________ 1990 5.0 getting all fixed up for next season 2004 mustang gt 520rwhp, 491 trq sold

October 10th, 2007, 05:47 PM	#5
jivepepper I Post Entirely Way Too Much Join Date: Mar 2006 Location: Under a sombrero Posts: 5,025 iTrader: 1 reviews	Just as long as it goes up when your wot. The harder you work the injector the more Fp is needed. I see over 50 sometimes. __________________ 665/541 WHP/WTQ 4.6L SOHC 2V ON 93 OCTANE PUMP GAS. NO METH INJ., NO E85, NO RACE GAS, N2O BABY BOTTLES! TRAP=POWER: 11.01 @135, IN SUMMER HEAT, 1350' TRACK, 315/35/17 DR'S

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