Please Help diagnose my 5.0

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motocrossed733

New Member

Aug 16, 2007

79

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0

Aug 24, 2008

#1

• Aug 24, 2008

• #1

O.k. here is the scoop just did a 50 mile trip got back into town cruising in third car started lurging, cutting out but lightly came to stop she died and would not restart, had to listen to some white trash bitch scream found on road dead as she drove off in her p.o.s. S10, I looked better pushing my 5.0, any way more importantly got her off road, and she fired made it a mile did it again and so on. made it home I can hear fuel pump come on car will run about a minute then start sputtering and then wont start for a bit after it dies the fuel pump sound different, I suspect the fuel pump, but dont want to mis diagnose I just bought a pressure tester what should pressure be at start? idle? if I lose pressure when it starts sputtering can I make the assumption the fuel pump is bad? I got a trip planned labor day and need the 5.0 thankls

 

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zachs90gt

New Member

Aug 20, 2008

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Aug 24, 2008

#2

• Aug 24, 2008

• #2

My stang did the same I was on the highway for a short while came home when I turned off the car the fuel pump was was still running & makeing a horrible sound so I turned the car back on & turned it off again it did the samething again. I figured it was the fuel pump so I replaced it & I haven't had a problem since. I am told to always try to keep the fuel tank at least half full to keep the fuel pump cool.

 

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motocrossed733

New Member

Aug 16, 2007

79

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0

Aug 24, 2008

#3

• Aug 24, 2008

• #3

car is running flawlessly right now 40 p.s.i. fuel pressure waiting for it to act up again, might have to take it around the block but a little afraid to.

 

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zachs90gt

New Member

Aug 20, 2008

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Aug 24, 2008

#4

• Aug 24, 2008

• #4

Is it the original fuel pump or is it an aftermarket? What year or stang?

 

90topdown

Member

Feb 16, 2006

138

1

16

Philadelphia, PA

Aug 24, 2008

#5

• Aug 24, 2008

• #5

Sounds like a bad fuel pump. Same exact thing happened to me a while ago. Original fuel pump quit after 15 years.

 

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motocrossed733

New Member

Aug 16, 2007

79

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Aug 24, 2008

#6

• Aug 24, 2008

• #6

I have had car for 2 years not sure if it is the original or not prob. the car is an 88GT Just drove it with the gauge hooked up and it ran great.

 

old_blue

15 Year Member

Nov 3, 2003

1,783

282

124

Aug 24, 2008

#7

• Aug 24, 2008

• #7

does the fuel pump sound different ? usually they get louder the older they get and when they need replacement.

 

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motocrossed733

New Member

Aug 16, 2007

79

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Aug 24, 2008

#8

• Aug 24, 2008

• #8

when the car was running rough and stalling the pump sounded different, but now sounds normal .

 

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1992mustangLX

New Member

Jun 13, 2007

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Aug 25, 2008

#9

• Aug 25, 2008

• #9

May be worth your effort to replace the fuel filter. Drain the contents into a clear container and see if there is any large debrix that may be clogging it. Unlikely this could be your main problem but will give you an idea of what exactly your fuel pump is picking up out of the tank.

 

1987stangman

Member

Jul 12, 2006

684

24

19

Aug 25, 2008

#10

• Aug 25, 2008

• #10

Could be anything from a bad fuel pump to a relay issue but fuel pumps usually just go without warning. I would pull codes and make sure the TFI modual or hall-effect dizzy is not giving trouble. I had my 87' GT cut out on me 1/2 mile from home at a redlight. I went home and hooked up a fuel pressure tester and got results in spec and then pulled codes and found out it was the dizzy. If the fuel pump does not act up after the car has warmed up in he heat of the day then it is not the issue.