I have recently changed the injector, the fuel filter , the mass air flow, now as I drive down the street the truck just stalls. If I bang on the gas tank it will restart and go for awhile longer so I have been investigating and have come to the conclusion I need to change the fuel pump. I need to know how to do it?? can someone please help me.........
Good Day,
I am assuming that you have the 4.3L V6.
The fuel pump is always a pain on trucks becasue you have to remove the tank to gain access. The pump is bolted in on the top side of the tank. I hope it doesn't have a full tank of gas as it needs to be drained(re-use when job is complete). Not to mention pulling a tank that's full of gas very heavy.
See this link for an overview:
http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152800a13e9
http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152800a145a
Here's how you test the fuel pump relay, and fuel pump:
Fuel Pump
Also see figure 4 which is digram 3 from this link, this is the schematic on the fuel pump, the fuel pump's hot wire is tan with a white stripe, if you can test the voltage of this wire you can confirm it is not an electrical problem.
http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c1528008f3ce
Also be sure to releive the fuel pressure before servicing
http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152800a1468
Let me know if any of this is jibberish to you and I can clarify further.
Good Luck again, and feel free to ask anymore questions.
As he said banging on the tank fixes the issue temporarily, doubt the relay is the issue, however, relay may be damaged from bad pump drawing excess current. Always good idea to replace when replacing pump. FWIW, aftermarket pumps are often noisy and failure prone. As this job is a PITA, get a good pump, either from dealer (pricey) or a Delphi brand. NOTE; some folks feel it is easier to remove the bed to service the pump, especially if you have any other reason to do so (eg: body work, wiring, fifth wheel install, etc.).
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Thank you for all your help....
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