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Posted on Aug 20, 2011
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No power to fuel pump Unless i jump the the wires to another hot wire then the truck will run untill i shut it off then it wont start and there is no power again ?????

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  • Posted on Aug 21, 2011
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Joined: Aug 21, 2011
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Check your fuel pump relay in the fuse box under the hood

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83 ford e350 starts to the start position and then dies in the run position need help
Sounds like you have a wiring problem, check the plug connector and wiring that plugs into the ignition switch, look for discoloration or signs of over heating or melting, if ok , unplug the connector from the ignition switch and with 2 jumper wires you can hot wire you car, and test if it stays running, jump the hot wire to the coil wire, and jump the hot wire from the starter to ground until it starts up.
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You know that how?

What testing told you that?

I would only be guessing (that is all we do here)

But it sounds as though the ignition switch is worn
& effects the fuel pump circuit, when in the on position,maybe!

Get yourself a wiring diagram & see how the system should work,
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God bless you
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I changed fuel pump an it started an ran fine for 20 min then shut off chang fuel pump relay an still nothing unless i hook up a hot wire an it runs fine
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When you say the fuel pump relay is good did you test for power to the relay circuit ?
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Whole fuel system
The main fuel pump in a Volvo is really well built and rarely fails (Bosch simply makes great fuel pumps). A good survival trick if you think a main fuel pump might be bad... give it a quick tap with a wrench. For best results, if possible, tap the pump when cranking the engine (while power is going to the pump). If the pump is bad, often the tap will make it come to life and it may stay running until you shut it off. This trick can get you back on the road and get you home in an emergency. If it's a bad fuel pump relay, this will NOT work as there will be no power going to your pump. If this is the case, you might try the below relay bypass "jump" trick to get power going to the pump. TESTING YOUR FUEL PUMP
How to "JUMP" the fuel pump circuit at your Volvo 240 fuse panel:The fastest method to make the main fuel pump run (bypassing the Fuel Pump Relay) is by jumping two circuits at the fuse panel (left side driver's kick panel).

You can make a jumper from a wire with stripped ends or even a straightened paperclip. Jump the circuits on the right side of the fuses for best results
For a 1979-84 240, jump fuse circuit #5 to #7.
For a 1985-93 240, jump fuse circuit #4 to #6.


If the main fuel pump doesn't begin running when jumped (you should definitely hear it humming), you either have a faulty fuel pump or faulty wiring to the pump (bad wiring is really common under an old 240, near the pump). This test of course assumes your battery is good.
If one of the fuses blows during this test, the pump circuit wiring is shorting to ground somewhere between the fuse panel and the pump.
thx



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