Fuel Pressure Question

S

sspnotcback

Member

Jan 5, 2013

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3

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Sep 18, 2013

#1

• Sep 18, 2013

• #1

ok guys i have a question about fuel pressure on my foxbody mustang.i installed an adjustable fuel pressure regulator and guage.at idle its right at 40psi,but i when u hit the throttle and rev it out it drops to about 30-32psi. so is it suppose to drop like that. my combo is a 351w with edelbrock rpm heads and trickflow intake.im still using the stock pump.

 

84Ttop

They make new pistons every day, so why worry?

5 Year Member

Jul 2, 2009

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South Jersey

Sep 18, 2013

#2

• Sep 18, 2013

• #2

Make sure you set the pressure with the vacuum line disconnected and plugged.

The pressure will vary based on the engine vacuum when everything is hooked back up and working correctly

 

Grabbin' Asphalt

10 Year Member

Jun 10, 2013

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Sep 18, 2013

#3

• Sep 18, 2013

• #3

From ones I've seen, under load driving it goes up.and stays up, when in "nuetral rev" it goes up some and drops again.

 

S

sspnotcback

Member

Jan 5, 2013

54

3

9

Sep 18, 2013

#4

• Sep 18, 2013

• #4

ok because i figured it should go up when reved.but like i said it drops to about 32psi. i have 30lb injectors is it most likely the stock fuel pump cant supply enough pressure. just seems like when driving it and when u put the engine under load it kinda sluggish.

 

Grabbin' Asphalt

10 Year Member

Jun 10, 2013

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Atlanta, Ga

Sep 18, 2013

#5

• Sep 18, 2013

• #5

yeah mine goes up then drops to a lower setting sitting still in neutral also, but when driving it under load it goes up and stays there until i let off the gas.