1997 Mitsubishi Lancer power to the fuel pump

Tiny
SPITERI INDUSTRIAL
  • MEMBER
  • 1997 MITSUBISHI LANCER
  • 1.5L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 164,000 MILES
Can't seem to find a relay or fuse for the fuel pump, checked for power at all the fuses all seems to be ok bet there isn't a specific fuse or relay for the pump, Im after a diagram or your thoughts on what & where it might be, not sure if its a sensor or switch not giving the pump signal to work
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Thursday, October 29th, 2015 AT 12:59 PM

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Tiny
CARADIODOC
  • EXPERT
What are you doing when you expect to find voltage to the fuel pump? Are you cranking the engine or you just have the ignition switch turned on? I'm guessing you have a no-start condition. If so, have you checked for spark?
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Thursday, October 29th, 2015 AT 1:06 PM
Tiny
SPITERI INDUSTRIAL
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Ignition is on, there is definitely spark, Ive even put fuel down the intake & the engine fired just didn't start due to no fuel. Ive put a new fuel pump in there is no power at the connector at the fuel pump with the ignition on.
Cheers Joey
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Thursday, October 29th, 2015 AT 1:35 PM
Tiny
CARADIODOC
  • EXPERT
Dandy. You should only see voltage to the fuel pump for about one second after turning on the ignition switch. That voltage will come back during engine rotation, (cranking or running). That is a safety feature to stop the pump from pumping raw fuel onto the ground if a fuel line gets ruptured in a crash.

If you're testing this with the fuel pump's electrical connector disconnected, use a test light instead of a digital voltmeter. Almost no current needs to flow in the circuit to get enough voltage for the meter to detect it and show 12 volts. That can be misleading. If you have a corroded splice, pitted relay contacts, or carbon-tracking across a break in the wire, the meter will show 12 volts but you won't get enough current through to run the pump motor. A test light requires substantial current to flow in the circuit for it to work, so it will give more accurate results.
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Thursday, October 29th, 2015 AT 8:35 PM

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