Fuel pressure problem

bock

Founding Member

Jan 7, 2002

648

2

19

Montreal,Qc

Apr 18, 2005

#1

• Apr 18, 2005

• #1

I cant get more than 40psi.

The fuel regulator is new(Kirban adjustable).

I tried 2 different gauges.

I can go under 40,but when i get to 40 , im turning the bolt of the regulator but the pressure stay at 40.


Can it be my fuel pump?

Its a holley 190 lph.And all was working great for 2 years.

 

Stang8URMPRT

Active Member

Dec 28, 2003

1,100

1

38

Daytona Beach, FL

Apr 18, 2005

#2

• Apr 18, 2005

• #2

I would say it could be the fuel pump, or a kinked fuel line, or a fuel leak somewhere.

 

S

Sicarius428

Active Member

Jan 6, 2004

2,085

5

49

Apr 18, 2005

#3

• Apr 18, 2005

• #3

How old is your fuel filter? Might want to change that just as an easy fix so you may not have to drop your tank and change the pump. The holley pump is a walbro, they are know to be pretty reliable... but not impossible to be the pump either. Trace your lines back and change the filter first.
Kevin

 

Stang8URMPRT

Active Member

Dec 28, 2003

1,100

1

38

Daytona Beach, FL

Apr 18, 2005

#4

• Apr 18, 2005

• #4

Sicarius428 said:

How old is your fuel filter? Might want to change that just as an easy fix so you may not have to drop your tank and change the pump. The holley pump is a walbro, they are know to be pretty reliable... but not impossible to be the pump either. Trace your lines back and change the filter first.
Kevin

Click to expand...

VERY TRUE.. Didnt' think of the filter... def. change that out if you haven't in a while.

 

bock

Founding Member

Jan 7, 2002

648

2

19

Montreal,Qc

Apr 18, 2005

#5

• Apr 18, 2005

• #5

Yes,i will change the filter first but it have about 2000 milles...

Went i turn off the ignition the pressure drop to zerp right there...

 

bock

Founding Member

Jan 7, 2002

648

2

19

Montreal,Qc

Apr 18, 2005

#6

• Apr 18, 2005

• #6

zerp=zero

 

J

jeffbigwood27

New Member

Nov 10, 2003

86

0

0

oklahoma city

Apr 18, 2005

#7

• Apr 18, 2005

• #7

bock said:

I cant get more than 40psi.

The fuel regulator is new(Kirban adjustable).

I tried 2 different gauges.

I can go under 40,but when i get to 40 , im turning the bolt of the regulator but the pressure stay at 40.


Can it be my fuel pump?

Its a holley 190 lph.And all was working great for 2 years.

Click to expand...

Sounds like the regulator might be messed up and is bleeding off the pressure over 40psi. How high are you trying to get it 40 should be ok.

 

bock

Founding Member

Jan 7, 2002

648

2

19

Montreal,Qc

Apr 18, 2005

#8

• Apr 18, 2005

• #8

im runing #19 injectors with TFS-tw f-303 and gt-40 intake... i need 48-50 psi...

I tried my old regulator and i have the same problem...

 

bock

Founding Member

Jan 7, 2002

648

2

19

Montreal,Qc

Apr 18, 2005

#9

• Apr 18, 2005

• #9

ttt

 

J

jeffbigwood27

New Member

Nov 10, 2003

86

0

0

oklahoma city

Apr 18, 2005

#10

• Apr 18, 2005

• #10

bock said:

im runing #19 injectors with TFS-tw f-303 and gt-40 intake... i need 48-50 psi...

I tried my old regulator and i have the same problem...

Click to expand...

I dont think it could be the filter bc if the filter is dirty it is more likely to cause the fuel pressure to drop while it is running. I would look at the pump being weak or make sure the gauge you are using works.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

33

129

Apr 18, 2005

#11

• Apr 18, 2005

• #11

have you tried carefully crimping the return line? no fuel in the vac line to the new FPR, right?

quick bleeding off can be from a bad FPR or check valve in the pump. good luck.

 

bock

Founding Member

Jan 7, 2002

648

2

19

Montreal,Qc

Apr 18, 2005

#12

• Apr 18, 2005

• #12

thre is no fuel in the vac line... i have tried 2 diffrent gauges:a little autometer scewed on the fuel line and a snap on gauge...

When yo say crimping the return line you mean kink it? to see if pressure build? and i f it does,what?

 

ALMOSTFINISHED

Member

Jan 8, 2004

315

0

17

Westchester County NY

Apr 18, 2005

#13

• Apr 18, 2005

• #13

I'd like to know this too, Please post the outcome.

Nick

 

bock

Founding Member

Jan 7, 2002

648

2

19

Montreal,Qc

Apr 25, 2005

#14

• Apr 25, 2005

• #14

OK...

I did change the fuel filter.Same problem.

I tried crimping the return line,and the fuel pressure did not move of 1 psi.I did this for 30-45sec and nothing was moving,car idling.

the pressure is ajustable until 38-40psi.When i remove the vacc under 38psi the pressure drop as it should be.But when at 38-40 ,it dont move.

When hiting 38psi and still turning the screw the pressure stop going up.


If it was a bad injector....Do the car would run like ***** ? cause it runing really good.. but lean. thks

 

I

Idwitheld-1`

New Member

Nov 30, 2003

335

0

0

Portland Oregon

Apr 25, 2005

#15

• Apr 25, 2005

• #15

Looks like the pump to me.

 

HISSIN50

"How long does it take to get help in here?

15 Year Member

Nov 29, 1999

31,179

33

129

Apr 25, 2005

#16

• Apr 25, 2005

• #16

good call Id.
when the return line is crimped, the fuel should have bottlenecked and the pressure should have gone up.

 

Killer50stang

New Member

May 11, 2004

632

0

0

Apr 25, 2005

#17

• Apr 25, 2005

• #17

bock said:

im runing #19 injectors with TFS-tw f-303 and gt-40 intake... i need 48-50 psi...

I tried my old regulator and i have the same problem...

Click to expand...

Go to 24# injectors, that will get you the fuel you need.

 

bock

Founding Member

Jan 7, 2002

648

2

19

Montreal,Qc

Apr 26, 2005

#18

• Apr 26, 2005

• #18

im changing the pump saturday...

will go with a walbro 255 lph (running a holley 190 now)


i will give you news guys!


thks.