Question about 1995 Ford F150 Styleside Regular Cab

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95 F150 2wd, interrupted fuel from the front fuel tank

My sons truck we bought used knowing the front fuel tank pump wasn't working. We are now on the third fuel pump in the front tank. Each one has started out working fine. Went through a whole tank of fuel on the 2nd fuel pump. Now the third pump is acting up the same way. The truck bed has been removed to allow for in use testing. Electrical supply appears to be consistent. 13.3 volts when working properly (50psi) and 13.3 volts when inadequate fuel pressure(20psi or less). I'm not sure how these fuel pumps operate. But I'm suspecting that the fuel pump in the rear tank has been the cause of the problem. Due to the feed-back fuel system I'm curious if the rear tanks fuel pump may be loosing its ability to check the fuel pressure when it is not the operating pump. Can anyone explain the operation or have any ideas. Thanks, Scott McCarter

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  • wsmccarter Jul 04, 2008

    With the bed off it was easy to determine that the appropriate fuel pump is running as selected by the dash board switch. 50psi is what each pump is putting out when chosen by the selector switch on the dash. I also measuered the voltage at each pump and the selected pump is getting the system voltage while the other is at zero. So I have eliminated the electrical supply as suspect. Also when the front fuel pump stopps supplying adequate pressure the voltage it is receiving is still correct and the other pump at zero. I can chose to select the rear tank at any time and it runs perfectly.

  • wsmccarter Jul 06, 2008

    Thanks for the ideas. I did switch brands of pumps and the location of purchase to hopefully avoid a bad run of pumps. The truck has been running fine for the past two days. Nearly one tank of gas has been run through with only a problem with the sending unit. The float needs to be replaced. It has a small crack and has become logged with fuel. The first repair to it didn't work and it is way too thin to braze without burning it up. Tried a fuel resistant sealant but the crack expanded. Hopefully this pump will keep up the good work. Thanks again.

  • Anonymous Mar 15, 2014

    is fuel tank pressure sensor on the fuel pump

  • Anonymous Mar 16, 2014

    acts like it looses fuel pressure

  • Anonymous Mar 17, 2014

    no electrical power is getting to the fuel pump in the tank. the fuel it self work with a jumper wire

  • Anonymous Mar 18, 2014

    Fuel pump is loosing pressure after it sets for a while

  • Anonymous Mar 24, 2014

    pumps gas out of fuel line when using the back tank

  • Anonymous Mar 27, 2014

    where do I hook the pressure gage to check pump pressure from tank?

  • Anonymous Apr 01, 2014

    Where is the return line on the engine of a 2005 Chevrolet kodiak truck? The fuel pump keeps blowing holes in the fuel pressure line in the tank. There appears to be no fuel return line.

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My idea, the pumps are working agianst each other. what is the line pressure supposed to be? I think the rear pump is burning the new pumps up. is the rear pump running when the front pump is running? Let me know MrrodneyLong@gmail.com

Posted on Jul 04, 2008

  • Rodney Long
    Rodney Long Jul 05, 2008

    is it possible to switch or have you already switched the brand of pump? I know this sounds trivial but it sounds like you have covered the bases short of the pump picking up trash from the tank and this aiding in its demise. And how many amps are you pulling on both pumps? Lets start with 1 min into operation and then 5 min into operation. Let me know MrrodneyLong@gmail.com

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