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Why does the fuel pump on 1993 ford ranger with a 4.o engine not shut off when switch is in on position & engine not running. takes ether to start it & then it floods REAL BAD.so what shuts th

I've changed fuel pump,filter & pressure regulator

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  • 27 Answers

You need to check fuel pump relay. Usually located under hood and I believe pass side fender well. That's odd for pump to run all the time unless relay has stuck on or has been jumped to run. (By that I mean someone has wired in run position) the computer usually grounds relay to turn on fuel pump

Posted on Nov 29, 2014

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Posted on Jan 02, 2017

RJones1125
  • 373 Answers

SOURCE: Truck would not start, gave it a blast of ether, it started

get your self a fuel pressure tester, hook it up to the fuel rail, you should get at least 30 psi with key on, 30 to 45 psi with engine running.

Posted on Mar 11, 2009

white104db
  • 1 Answer

SOURCE: 94 Ford Ranger starting problems

same issue on mine and it was the coolant temp sensor about 10 bucks

Posted on Mar 20, 2013

SOURCE: I have a 1993 Ford ranger and the fuel pump keep

Your at a point where you need to check all your
battery feeds to the pump,all ground side wiring.
Also check current draw & look at the pump wave
form with a scope
The question is what failed on each pump.
I have no wiring diagrams & thus no idea what is
in the system that controls it you could test

Posted on Aug 03, 2013

  • 110 Answers

SOURCE: erratic idle & shutting off

have you replaced the egr valve

Posted on Feb 09, 2014

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