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Old 11-20-2009, 12:16 PM   #1
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Default fuel pump wont run..help please!!!!

i went on the impala forum and didnt find anything about this problem i have. short story i had 2 codes p0200 and p0300, i was driving and the car pretty much stalled rpms went to zero and i let off the gas as soon as it did it and it came back to life.. went inside the shop came back out and the car would stumble really bad and shake so i finally got it to run good enought to get it home then took a nap cam back out the car did the same again.. when i turn the key on and off you cant hear the pump and you cant see it come out the fuel line.. i dropped the tank of course my friend got there and told me how to bypass the relay and we got the pump to run.. i replace the pump relay and it didnt do anything still cant figure out the problem?
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Old 11-20-2009, 02:04 PM   #2
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Isn't there also a fuse for the fuel pump?
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Old 11-20-2009, 03:27 PM   #3
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Isn't there also a fuse for the fuel pump?

i dont know? i dont think so but i do know theres 2 fuses for the injectors
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Old 11-20-2009, 11:58 PM   #4
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What kind of shape was the wiring in on top of the tank? The wires tend to short out or melt. Did you check fuel pressure?
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Old 11-21-2009, 08:27 AM   #5
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What kind of shape was the wiring in on top of the tank? The wires tend to short out or melt. Did you check fuel pressure?

i dont think its the wires because i can send 12 v to the pump by the fuse box and the pump will run..

does if have to be under pressure just to run with the key
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Old 11-21-2009, 11:27 AM   #6
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You may have a pump that runs but isn't putting out enough pressure to make the car run. You can pick up a pressure gauge and adapters for $20 at the local parts store.

code P0200 is injector control circuit
code P0300 is engine misfire Detected
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Last edited by retirednak; 11-21-2009 at 11:38 AM.
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Old 11-21-2009, 11:29 AM   #7
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You may have a pump that runs but isn't putting out enough pressure to make the car run. You can pick up a pressure gauge and adapters for $20 at the local parts store.

i did about a month ago and i got 38 psi, the thing is i turn the key and it wont run but i can but a 12 volts to a fuel pump wire in the engine compartment and make it run
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Old 11-21-2009, 11:41 AM   #8
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Do you have a FSM?
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Old 11-21-2009, 01:53 PM   #9
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Quote:
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Do you have a FSM?

whats a FSM?
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Old 11-21-2009, 02:36 PM   #10
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factory service manual
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Old 11-21-2009, 02:48 PM   #11
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Quote:
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factory service manual


the one that came with the car yes and i bought one from autozone
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Old 11-21-2009, 03:00 PM   #12
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I'm talking about the GM service manual,there is 2 books both red colored.
If you do have the correct manuals they will run down step by step how to trouble shoot each code your car has thrown. I wish the impalass forum was up and running,you might be able to find somebody able to help you better then I can. I have my manuals but it would take way too long to type out.
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SStreetlights
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Old 11-21-2009, 03:23 PM   #13
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Quote:
Originally Posted by retirednak View Post
I'm talking about the GM service manual,there is 2 books both red colored.
If you do have the correct manuals they will run down step by step how to trouble shoot each code your car has thrown. I wish the impalass forum was up and running,you might be able to find somebody able to help you better then I can. I have my manuals but it would take way too long to type out.

where can you get one and how much?
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Old 11-21-2009, 03:50 PM   #14
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I bought mine on ebay.com and I paid something like $45 or $50. Most are used but sometimes you might find a brand new set. Mine was used and had old greasy finger prints on it,but for the most part pretty good shape. The FSM are heads above the books you buy at the parts stores. They have easy step by step instructions a kid could follow.
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Home Plate/First Base Delete
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SStreetlights
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Old 11-21-2009, 04:17 PM   #15
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The other site is finally up and running. I borrowed this from the other site. To test Rent (Free when you return it) a Fuel pressure gauge from Autozone or Advanced auto parts. Then connect it as previously descibed to the Schrader valve A helper turning the key forward (Not starting the car) to do the test would be a plus here.

Fuel pressure testing
1. Remove cap on schrader valve, Connect the fuel pressure gauge to the schrader valve.
2. Ignition OFF For 10 Secs - AC turned OFF
3. Ignition key ON, Fuel pump will run for approx 2 secs.
(It may be nessasary to cycle the Igniton key OFF and ON more than once to obtain max pressure)
4. Note max pressure on the gauge with the fuel pump running.
Pressure should be between 41-47 PSI
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K&N FIPK
SStreetlights
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Custom tune by pcmforless.

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