Question about 1993 Jeep Grand Cherokee

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No fuel to engine

Fuel pump is not working

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  • Jeep Master
  • 1,455 Answers

Either your fuel pump is bad or the ecu that controls power to the pump is bad. Check to make sure the check engine light comes on, on the dash, when you turn on the ignition. If it does not come on, then the ecu needs to be repaired. If the ck engine light does come on, then test the fuel pump and check the pump fuse to see if it's blown.

Posted on Nov 07, 2012

  • 2 more comments 
  • Kevin Daniels Nov 07, 2012

    Either your fuel pump is bad or the ecu that controls power to the pump is bad. Check to make sure the check engine light comes on, on the dash, when you turn on the ignition. If it does not come on, then the ecu needs to be repaired. If the ck engine light does come on, then test the fuel pump and check the pump fuse to see if it's blown.

  • Don Swihart Nov 18, 2012

    Where is the ecu ? The ck engine is not coming on at all

  • Don Swihart Nov 18, 2012

    its over loading with gas but wont start

  • Kevin Daniels Nov 19, 2012

    The ecu is located in the engine compartment, bolted to the passengers side firewall, behind the coolant overflow bottle.

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This truck uses a high pressure fuel system, key must be on for the electric fuel pump, which is in the tank, to work. Fuel pump senses when pressure drops, so that it will shut off if there is full pressure, and engine not running. If there is lower pressure, such as a broken line, it will continue to pump, if the engine is running. If you're asking if it has a safety feature shutting it off in an accident, no it does not, except if the engine shuts off due to the accident, fuel pump will not work, unless key is turned off and then back on, and will then work for about 5 seconds and shut off, unless engine is started. If you're asking why the fuel pump doesn't work after an accident, it's most likely damaged, or a wire has been damaged, OR the computer maybe damaged (therefore telling it to turn on/off when key is on and engine running with key on and pressure is low, or at the right level to run the engine. Again, if you turn the key on and do not start the engine, fuel pump will work briefly for about 5 seconds to bring pressure up to where it can be started, then the fuel pump will work again when the engine is started (so the fuel pump isn't running with the engine off for very long.)

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Fuel pump


you are up against some diabolical engineering.
When I dismantled my pintara fuel pump I found that nissan engineers think it is good to put 12V CONNECTORS INSIDE THE FUEL TANK!
Have you tried tapping the housing with a spanner before starting the engine? worked for me. Its a circular housing behind the rear seat. Dont replace pump with a GOSS fuel pump they are useless.
Anyway I'll never buy another car that has high current electrical connectors immersed in petrol vapour!
I think the best thing to do is put another fuel pump in the engine bay. Also check the modulator. Its the black thing at the end of the fuel rail.
The best advice I can offer is DONT BUY A NISSAN!!!!!

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