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Dead 96 850T - cranks and sparks but won't start 850

The fast grocery-getter is dead in the driveway.

I made a short trip, about 5 miles, parked the car in the driveway, and the next AM it would not start.

In the past, severl times I have had this problem where you make a "short" run, like backing it out of the garage, then shut it off, and it won't start. In that case you could just crank the 'ole SOB for about a minute straight and it would fire...run rough for a few seconds, then work OK.

But this time it's different, and way beyond any idosynchrosies I've seen before.

I had this to a mechanic for some other problems a few months ago, and after fixing those (radiator, alignment) he suggested I change the plugs, wires, rotor and cap. I did this (all Bosch parts) and still no-start-y.

I did pull a plug and there was spark.

I can squirt a little starting ether into the air cleaner and it will fire...but not run for more than a few seconds.

But I disconnected the fuel line at the injector manifold, cranked the car over again, and look ma, NO GAS.

I suspect the fuel relay, fuel filter, or fuel pump?

Fuel filter is easy. Relay is $50 and no-return. Pump is $400, looks like a PITA to replace and gain, no return.

Question: Does this car "sense" that there is an open fuel line, and thus close the fuel relay (safety, of course) shutting off the fuel pump?

Follow-on question: If so, how can I check that I have fuel pressure?

'nuther question: Is there a procedure to test the fuel pump relay with a Volt-Ohm meter?


I need to get this fixed. Avis is gving me Chevies, for God's sake. Plus, I need to go get groceries! Really appreciate your help!








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    Dead 96 850T - cranks and sparks but won't start 850

    Hi fastgroceries...

    You can check for 12 volts at the connector to the pump. If it's there, the pump is bad.

    If it isn't, then you have to check to see if the fuel pump relay is pulling in. Just bear in mind that fuel pump relay failures are common, and the pump itself has a finite lifetime.

    If the pump is bad, most folks change the relay at the same time, based on the assumption that before failure, the pump probably drew over-current, thus damaging the relay contacts.

    I assume you've checked the fuses, but, in general, a fuse doesn't blow unless there is something else wrong downstream.

    Changing the pump is easy... the mounting flange is easily accessed through the trunk.

    Good luck

    Marty
    '96 855T








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    Dead 96 850T - cranks and sparks but won't start 850

    the fuel pump is not that bad to change, just messy if you have more that 1/4 tank. you need to check for power while cranking at the relay and at the pump connector. no power at the relay means a fuse or some other problem, no power at the pump means the relay or-not likely-a wiring issue. power at the pump means a dead pump or a bad ground for it. just a suggestion, not cast in stone-if it needs a pump, change the relay. when the pump gets tired, they draw more amps. that tends to weaken the relay. on other cars, mb especially, the old relay will die with a new pump on, even if the new pump draws fewer amps. good luck, chuck.







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