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Old 10-04-2017, 09:39 PM   #1
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Jumping the fuel pump

So been trying to jump my fuel pump in the parts car to drain the gas out of it. Anyways i jumped the relay only to find with the key on the pump runs for 1-2 seconds then shuts off. I figure it is going to take a long time to drain the 3-4? gallons of 5 year old gas that is in the tank. So is there an easy way to jump this system. Found it has a fuel pump drive module under the seat. Anybody know which wires to jump. My miata I can jump two wires and it runs the pump. Going to hunt around for a shop manual to see if I can find this info. Who knew it was so hard to drain the gas out.


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Old 10-04-2017, 09:54 PM   #2
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Nope that is what it's supposed to do. 3-4 GALLONS JUST DROP IT OUT WITH A JACK.
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Old 10-04-2017, 09:57 PM   #3
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Originally Posted by pasta View Post
Nope that is what it's supposed to do. 3-4 GALLONS JUST DROP IT OUT WITH A JACK.
Normally I would but i want to add some fresh gas to the tank to see if the engine is any good in the parts car. So trying not to spend an hour dropping the tank. There has to be a way to jump the pump.
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Old 10-04-2017, 10:14 PM   #4
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There is, get a wiring diagram and apply 12v directly to the Lin on the wire harness... There are a few posts about it. I did that with my ZX3 a few years back when I was doing a full engine rebuild.
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Old 10-04-2017, 10:48 PM   #5
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This ^^^^^^^^^^^
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Old 10-05-2017, 08:59 AM   #6
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Like said, jump 12 volts directly to battery to avoid the PCM switching it off after two seconds.
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Old 10-05-2017, 08:29 PM   #7
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So unplugged the connector. Found the pins for the pump. Will take a picture of which ones are needed. Was able to jump the pump and get the 3 gallons of bad gas out. Car is running better but I think timing is off half a tooth. More work to be done but at leas the old gas is gone.
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