Fuel pressure

T

TG Ross

New Member

Nov 15, 2021

2

0

1

California

Nov 15, 2021

#1

• Nov 15, 2021

• #1

so i got this 87 carbureted notchback im having fuel pressure problems , so when i start the car the pressure is at about 6-7psi after warming up it drops to about 3-4 and will not raise anymore if trying to adjust the regulator i tried replacing fuel pump, carb, and checking all gas lines. Any idea of whats going on

 

General karthief

wonder how much it would cost to ship you a pair

Mod Dude

Aug 25, 2016

28,117

10,735

213

polk county florida

Nov 15, 2021

#2

• Nov 15, 2021

• #2

What carb is on there?
Is it running out of gas at high rpms?
3-4 lbs on a carb is on the low end of good,
Oh, manual pump or electric?

 

T

TG Ross

New Member

Nov 15, 2021

2

0

1

California

Nov 15, 2021

#3

• Nov 15, 2021

• #3

General karthief said:

What carb is on there?
Is it running out of gas at high rpms?
3-4 lbs on a carb is on the low end of good,
Oh, manual pump or electric?

Click to expand...

edelbrock 650 and yes it loads up alot and i have a holley red electric pump

 

manicmechanic007

5 Year Member

Sep 26, 2017

2,562

727

143

Roy, Utah

Nov 16, 2021

#4

• Nov 16, 2021

• #4

TG Ross,
Sounds like your Holley fuel pump is failing
The carb needs 5 to 6 lbs
The new pump will put out almost double that and so you will have to adjust the regulator down again

 

2

2001busa1

New Member

Jun 23, 2017

3

0

1

Jan 20, 2022

#5

• Jan 20, 2022

• #5

TG Ross said:

so i got this 87 carbureted notchback im having fuel pressure problems , so when i start the car the pressure is at about 6-7psi after warming up it drops to about 3-4 and will not raise anymore if trying to adjust the regulator i tried replacing fuel pump, carb, and checking all gas lines. Any idea of whats going on

Click to expand...

If you have one of the little 1.5 inch gauges before the carb when the engine and gauge gets hot the gauge doesn’t read correctly. Did you fix it yet ?