fuel pressuer??

whitepony · 09-16-2003, 06:48 PM

what should my fuel pres. be at just ideling?? 42p.s.i?
and what should it be at when i give it alittle gas but not moving done the road. just reving(not hight)

how do i change the presuer if not at what it should be?

Hethj7 · 09-16-2003, 08:45 PM

What exact pressure your car is best at may differ a little from someone else's. It has been a long time since I even looked at mine, but I think it is around 38 psi. I don't know what kind of pressure it gets once moving, as my gauge is mounted under the hood.

To adjust the pressure you need to buy an adjustable fuel pressure regulator. The stock regulator is not adjustable.

billheis · 09-16-2003, 09:29 PM

When checking the fuel pressure you will want to check it with vacuum hose on and off. With no vacuum will be you will have high pressure. Like hethj7 said 38 psi is a good starting point with vac off. With hose connected it should drop about 8 to 10 pounds and as vacuum in engine varies the fuel pressure will vary.
Bill

Hethj7 · 09-17-2003, 10:07 AM

Man, it has been so long since I have even thought about it I forgot to mention taking the vacuum off

. Thanks billheis!

09-16-2003, 06:48 PM	#1
whitepony Registered Member Join Date: Feb 2003 Location: ontario canada Posts: 165	fuel pressuer?? what should my fuel pres. be at just ideling?? 42p.s.i? and what should it be at when i give it alittle gas but not moving done the road. just reving(not hight) how do i change the presuer if not at what it should be?

09-16-2003, 08:45 PM	#2
Hethj7 Mizzou Tigers Join Date: Apr 1999 Location: weston, MO United States Posts: 1,455	What exact pressure your car is best at may differ a little from someone else's. It has been a long time since I even looked at mine, but I think it is around 38 psi. I don't know what kind of pressure it gets once moving, as my gauge is mounted under the hood. To adjust the pressure you need to buy an adjustable fuel pressure regulator. The stock regulator is not adjustable. __________________ 2006 Mustang GT 1990 LX GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved) 1998 Contour SVT Rice Haters Club Member #244

09-16-2003, 09:29 PM	#3
billheis Registered Member Join Date: May 2001 Location: Fernandina Beach, FL 32034 Posts: 178	When checking the fuel pressure you will want to check it with vacuum hose on and off. With no vacuum will be you will have high pressure. Like hethj7 said 38 psi is a good starting point with vac off. With hose connected it should drop about 8 to 10 pounds and as vacuum in engine varies the fuel pressure will vary. Bill __________________ Bill Heiser 90 Convertable 5.0 LX, ported E7s w/ THumper valve job, TFS street, FR 65mm TB, B cam w/1.7 cobra rockers, kirban AFPR, Mac CAI, Mac Headers, off road h, 3 chamber flows, Crane ign. box, 3:73s, Art Carr AOD & 2600 converter

09-17-2003, 10:07 AM	#4
Hethj7 Mizzou Tigers Join Date: Apr 1999 Location: weston, MO United States Posts: 1,455	Man, it has been so long since I have even thought about it I forgot to mention taking the vacuum off . Thanks billheis! __________________ 2006 Mustang GT 1990 LX GT-40 motor 262 horsepower, 307ft-lbs (sold but forever loved) 1998 Contour SVT Rice Haters Club Member #244

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