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How are you determining the fuel pump is not pumping? I would take a injection rail test with a gauge and see what pressure you have. If you don’t have pressure but the pump is running then the pump is defective or the pump output hose/line linking to the sending unit inside the tank is pumping the fuel right back into the tank.
If you have pressure but the engine won’t start then you have an injector pulse issue. You can actually have pressure at the rail but still no delivery because the injectors serve that function based on a magnetic pick up signal.Quoted From jacobnbr1:
How are you determining the fuel pump is not pumping? I would take a injection rail test with a gauge and see what pressure you have. If you don’t have pressure but the pump is running then the pump is defective or the pump output hose/line linking to the sending unit inside the tank is pumping the fuel right back into the tank.
If you have pressure but the engine won’t start then you have an injector pulse issue. You can actually have pressure at the rail but still no delivery because the injectors serve that function based on a magnetic pick up signal.I’m also wondering if this was the type of pump that you need to crimp in a new connector for, if it was and the wires got switched the pump may be running backwards and not sending fuel toward the engine.
I don’t have pressure but the pump turns on for a few seconds when I turn the key to on and I can here the pump running when I turn the car over. This is the second pump I have installed in a week the first one didn’t run at all so they sent me a replacement, It is a aftermarket pump I purchased on ebay I thought I would save money. And the pump did come with a new wire connector. Any suggestions on a brand of pump ac delco, bosch, etc. to get I’m thinking about getting a refund and going to a parts store to get a new one. thanks for the responses.
pull vacuum on fuel pressure regulator and make sure there in no fuel in there also check out this video. http://www.youtube.com/watch?v=K7qVwQSZ6OU&feature=player_detailpage
The pump may not be the issue if you can here it running. You might want to check the actual fuel pressure while you crank as well as check for spark.
I found the problem with the fuel pump is was the new wire connector that comes with the new pump, The wires are color matched so you would think black to black,gray to gray, purple to purple etc. but that is not the case the wiring was wrong I had to experiment to find the correct wiring until the pump pumped in the right direction. thanks for the tip about the wire connector. My s10 is running great Thanks again guys for all your help.
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