Question about 1997 Isuzu Rodeo

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SENDING UNIT ???????

Sometimes my rodeo won't start. when i turn the key on and off repeatedly i will hear the sending unit energize. at first i thought that was the fuel pump but my manual says the fuel pumps are located on the motor. this noise is coming from the gas tank area. every time i hear this noise it will start. I read a consumer report about a wire that likes to corrode by the right rear wheel that im assuming is to the sending unit (it said the fuel pump) but I am unable to find that report again. my rodeo also periodically misses when i am driving. thank you

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  • osconst Jul 01, 2009

    THE car will not even start unless i hear the sending unit energize. i might have to turn the key on and off ten times in order to get it to energize. Then it starts

  • gerry bissi May 11, 2010

    You are hearing the fuel pump run for 5 seconds. It does this to charge the system to 40 psi. then it shuts off, unless the engine is running. You only want the pump to run when the engine is running. So, the pump runs for 5 seconds, then runs during cranking, and runs when engine is running. maybe the fuel pump relay is cutting out or the computer is shutting the pump down after the engine is running. both very unlikely.

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  • Isuzu Master
  • 450 Answers

Most of fuel pumps were in tank, wire corrodes is harness under right front seat floor pan to tank
if fuel pump buzz is heard and car runs and when it doesnt run you cant hear the fuel pump try
turn ignition off wait 10 seconds
turn ignition to on position to (prime or hear pump buzz)
no buzz fuel pump not working check fuel pump relay(swap with another) and try again?
you could use test light to pump wiring and make sure your getting power to pump on this prime test no power relay or wiring problem.
power at pump, but no buzz fuel pump faulty

Posted on Jul 03, 2009

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