Is My Fuel Pump Failing? Battery? Spark Plugs?
09-15-2007, 10:16 AM
#1
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Is My Fuel Pump Failing? Battery? Spark Plugs?
Hey Everyone,
I tried to get in my car this morning to run an errand, and almost immedialty after I pulled out of the parking sport and took off, the little wrench light (not check engine) came on. So I pulled to the side, turned off the car and turned it back on, it roared to life, and died. Reset the key, waited a little, tried it again, and everything seemed fine so I kept going, and it cam one again within 20 seconds. I turned it off and on at least 5-6 times, and every time this happened. The one itme it didn't, it died after about a 1/8 mile (coming to a stop).
No code, no CEL, just that stupid little wrench. I thought it might be somethign wrong with the fuel, so I turned the Boost-a-Pump up all the way, but I still have a pretty low fuel pressue, milde acceleration use to give me 34-36 PSI now its about 28PSI. Idle use to be around 30PSI but now its 26PSI. I don't know is its the Fuel Pump thats starting to die or if the Alternator died and my batteries (yes two batteries) are dead and the car is failing because there is enough power to start the car but not to keep it running? What do ya'll think?
Or maybe, since I've ben running pretty rich (10.8) for a while - about 6 months now - there is something wrong with my spark plugs.
~Fred
I tried to get in my car this morning to run an errand, and almost immedialty after I pulled out of the parking sport and took off, the little wrench light (not check engine) came on. So I pulled to the side, turned off the car and turned it back on, it roared to life, and died. Reset the key, waited a little, tried it again, and everything seemed fine so I kept going, and it cam one again within 20 seconds. I turned it off and on at least 5-6 times, and every time this happened. The one itme it didn't, it died after about a 1/8 mile (coming to a stop).
No code, no CEL, just that stupid little wrench. I thought it might be somethign wrong with the fuel, so I turned the Boost-a-Pump up all the way, but I still have a pretty low fuel pressue, milde acceleration use to give me 34-36 PSI now its about 28PSI. Idle use to be around 30PSI but now its 26PSI. I don't know is its the Fuel Pump thats starting to die or if the Alternator died and my batteries (yes two batteries) are dead and the car is failing because there is enough power to start the car but not to keep it running? What do ya'll think?
Or maybe, since I've ben running pretty rich (10.8) for a while - about 6 months now - there is something wrong with my spark plugs.
~Fred
09-15-2007, 10:29 AM
#2
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RE: Is My Fuel Pump Failing? Battery? Spark Plugs?
Electronic throttle control (if equipped): Illuminates when the engine has defaulted to a ’limp-home’ operation. Report the fault to a dealer at the earliest opportunity.
Thats what the wrench means, but why is it doing that? This isn't the first time its done it, it probably done it about 3 or 4 times, but every other time I've been able to turn it off and on and everything goes back to normal.
~Fred
Thats what the wrench means, but why is it doing that? This isn't the first time its done it, it probably done it about 3 or 4 times, but every other time I've been able to turn it off and on and everything goes back to normal.
~Fred
09-15-2007, 10:35 AM
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RE: Is My Fuel Pump Failing? Battery? Spark Plugs?
Ya, Everyone here said the stock pump is good up to 450 hp, especially with a Boost-A-Pump. I'm only pushing 380 to the wheels (running pretty conservative).
~Fred
~Fred
09-15-2007, 12:33 PM
#5
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RE: Is My Fuel Pump Failing? Battery? Spark Plugs?
The battery doesn't power the car once it's running so that's not your problem. It could very well be the alternator. Do you hear the pump run when you first turn the key to on before starting? What's the pressure at after the pump stops running before you start the car?
I don't know what my stock pump pressure was, but with the GT500 pumps it goes up to 56-60psi before starting the car and is normally at 38-42psi when cruising or idling.
The car doesn't set a CEL? Seems like it would have to if the engine dies, but what do i know.
I don't know **** about the boost-a-pump, but I know a lot of people don't like them.
I don't know what my stock pump pressure was, but with the GT500 pumps it goes up to 56-60psi before starting the car and is normally at 38-42psi when cruising or idling.
The car doesn't set a CEL? Seems like it would have to if the engine dies, but what do i know.
I don't know **** about the boost-a-pump, but I know a lot of people don't like them.
09-15-2007, 05:22 PM
#7
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RE: Is My Fuel Pump Failing? Battery? Spark Plugs?
ORIGINAL: moosestang
The battery doesn't power the car once it's running so that's not your problem. It could very well be the alternator. Do you hear the pump run when you first turn the key to on before starting? What's the pressure at after the pump stops running before you start the car?
I don't know what my stock pump pressure was, but with the GT500 pumps it goes up to 56-60psi before starting the car and is normally at 38-42psi when cruising or idling.
The car doesn't set a CEL? Seems like it would have to if the engine dies, but what do i know.
I don't know **** about the boost-a-pump, but I know a lot of people don't like them.
The battery doesn't power the car once it's running so that's not your problem. It could very well be the alternator. Do you hear the pump run when you first turn the key to on before starting? What's the pressure at after the pump stops running before you start the car?
I don't know what my stock pump pressure was, but with the GT500 pumps it goes up to 56-60psi before starting the car and is normally at 38-42psi when cruising or idling.
The car doesn't set a CEL? Seems like it would have to if the engine dies, but what do i know.
I don't know **** about the boost-a-pump, but I know a lot of people don't like them.
ORIGINAL: hammeron
were you able to make your 8psi of boost
routinely, before these recent developments?
were you able to make your 8psi of boost
routinely, before these recent developments?
~Fred
09-18-2007, 10:54 AM
#9
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RE: Is My Fuel Pump Failing? Battery? Spark Plugs?
Well, I tried it again today and everything worked really well. I ran a few errands and picked up some takout. One thing I noticed though was that on start, the Fuel Pressure Gauge pretty much goes nuts and finally stabilizes after everything is up and running (20 seconds).
After that, any use of the electrical system (radio, very loud radio detector, windows, phone charger, etc) will cause the fuel pressure to flucuate by 4-5PSI.
I think that kind of excludes the spark plugs. Batteries (I have one for the car and one for ethe audio system hooked up in paralell), Alternator, or Fuel Pump/BAP system. Whats the easiest to test?
Or was it just morning sickness....my car is pregnant.
~Fred
After that, any use of the electrical system (radio, very loud radio detector, windows, phone charger, etc) will cause the fuel pressure to flucuate by 4-5PSI.
I think that kind of excludes the spark plugs. Batteries (I have one for the car and one for ethe audio system hooked up in paralell), Alternator, or Fuel Pump/BAP system. Whats the easiest to test?
Or was it just morning sickness....my car is pregnant.
~Fred
09-18-2007, 11:18 AM
#10
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RE: Is My Fuel Pump Failing? Battery? Spark Plugs?
if it were me.....
there are too many variables at work here...
i would disconnect the secondary battery and any
unnecessary accessories while troubleshooting....
it sounds like the FPDM or the pump itself, is
not getting a stable driving voltage....
a) alternator
b) FPDM
c) fuel pump
d) one of the 2 car batteries has a bad cell
there are too many variables at work here...
i would disconnect the secondary battery and any
unnecessary accessories while troubleshooting....
it sounds like the FPDM or the pump itself, is
not getting a stable driving voltage....
a) alternator
b) FPDM
c) fuel pump
d) one of the 2 car batteries has a bad cell