Bad fuel pump symptoms

9

94blackgt 1621

New Member

Jul 13, 2003

79

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0

Nov 16, 2004

#1

• Nov 16, 2004

• #1

What are some symtoms of a bad fuel pump, or a fuel pump that can't put out as much fuel as your car needs.

Right now I basically have long tubes, a trick flow street intake, and pulleys, and I ported out my stock heads a little.

My car out of nowhere started popping under load and hesitating. Could this be from a bad fuel pump?

 

bln92cpe

New Member

Dec 15, 2003

158

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0

Los Angeles, CA

Nov 16, 2004

#2

• Nov 16, 2004

• #2

may want to look into bigger injectors and a fuel pump..I got a 255 pump because my car is starving..I go through a 1/2 tank of gas in 2 days...

 

willys1

Active Member

Dec 2, 2003

1,004

1

36

New Jersey

Nov 16, 2004

#3

• Nov 16, 2004

• #3

I dont think its your FP.

 

HISSIN50

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

15 Year Member

Nov 29, 1999

31,179

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Nov 17, 2004

#4

• Nov 17, 2004

• #4

have you pulled codes? do you have a FP gauge you can hook up to monitor pressure?

two major things control FP - the pump and the regulator. bad regulator will dump too much fuel and make it seem as though the pump is inadequate.

one would need to provide more info and do more testing to diagnose further (i too would not be jumping all over the fuel system w/o more info).

good luck.

 

PhLoBuS

New Member

Aug 15, 2004

473

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Beverly, MA

Nov 17, 2004

#5

• Nov 17, 2004

• #5

the 255 fuel pump causes you to go through half a tank in 2 days??!

 

HISSIN50

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

15 Year Member

Nov 29, 1999

31,179

34

129

Nov 17, 2004

#6

• Nov 17, 2004

• #6

one can run a 1000 GPH pump - if the regulator is working, fuel consumption will remain the same (you are simply pumping 97% of it back to the tank).

 

9

94blackgt 1621

New Member

Jul 13, 2003

79

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0

Nov 17, 2004

#7

• Nov 17, 2004

• #7

I ordered the fuel pump because all my plugs were white even though my fuel pressure was around 41.

 

U

unistang

New Member

Sep 23, 2002

7

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0

Aug 24, 2007

#8

• Aug 24, 2007

• #8

I had this same problem on my buddy's 91 GT. Turned out to be the electronics in the distributor. If you have a spare or know someone who does, drop that in and see if it cures it. It's an easy fix. Why order a new pump if the pressure is fine? Even with smaller injectors it should still run alright, you just won't have the power... your computer adjusts all this automatically. Your AF could be off too. Is your MAF calibrated? The problem sounds electronic related... not fuel. Just givin you a heads up.

Nick

 

HISSIN50

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

15 Year Member

Nov 29, 1999

31,179

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Aug 25, 2007

#9

• Aug 25, 2007

• #9

Nick, it's been a few years. I hope his car is fixed by now.

 

fivemustangs

Member

Dec 22, 2007

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17

Bar Harbor, Maine

Sep 8, 2009

#10

• Sep 8, 2009

• #10

Now thats pretty funny!

 

L

LX Tails

New Member

Jun 25, 2009

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Sep 9, 2009

#11

• Sep 9, 2009

• #11

A vaccum leak will cause popping under load. Try running your car with the oil cap off and see what happens.

 

HISSIN50

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

15 Year Member

Nov 29, 1999

31,179

34

129

Sep 9, 2009

#12

• Sep 9, 2009

• #12

LX Tails said:

A vaccum leak will cause popping under load. Try running your car with the oil cap off and see what happens.

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HISSIN50 said:

.....it's been a few years. I hope his car is fixed by now.

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