I am in the progress of making a tube buggy and I relocated my gas tank between my frame rails.

When I moved the tank I did not cover the tank hole and we had an unexpected thunderstorm that night. After that I tried starting it the next day and It wold not work. Then, I put a bottle of dry gas in it and that did not help. I drained the gas and put fresh gas in and that did not work.

The truck will fire up and run for about 5 seconds and then die out. During those five seconds if i hit the gas, it will cut off imediately.

I can hear the fuel pump pumping.

So far, I changed the filter and borrowed my buddies mass air-flow sensor and swaped them.

If I spay starting fluid in the throttle body it will keep on runnig.

Please help me. I am about to drain the gas again, pour it over the truck, and burn the damn thing!!!!!

Sounds like it has water at the injectors and it wont flow it through the nozzel cause its to thick.Have you tried putting some methylated spirits in the tank to evaporate the water.

Try cracking the fuel line off at the regulator end of the fuel rail and crank it over for a bit to get the water out of the injectors/rail.

It sound like your not getting power to the fuel pump after start. Put a volt meter on the fuel pump. With the key on meter should read 0. Have someone turn the key to start and the voltmeter should read about 12V. If the voltmeter goes back to 0 after the key goes back to the ign position they you have a problem with the fuel cut relay circuit. Fuel pump relay signal power comes from the start position of the key and the airflow meter.

Just 'cause you can hear the fuel pump running, doesn't mean it's working properly. I've had fuel pumps go out, and I could still hear them running, but nowhere near enough fuel was being pumped--pressure too low, pump toast. Changed the pump, no problem.

From what you describe, I'd say to change the fuel pump (or at least check the pressure at the engine)... that'd be my first course after having drained and replaced the fuel.

FWIW, symptoms are exactly the same as my MR2 had when it killed a fuel pump, and also the same as my '86 pickup had when it killed one. Both cases, part throttle and idling, it'd run for a while, then die. Stomp it, it dies immediately. It progressed quickly into just-won't-run-at-all condition from there.

Thanks for the help!

If it is the fuel cut relay circuit, where is it located at?

If it is not that, I will have to get a Celica pump from the junkyard.

Thanks again for the quick and helpfull responses,

Matt

Originally posted by Kasper
Thanks for the help!

If it is the fuel cut relay circuit, where is it located at?

If it is not that, I will have to get a Celica pump from the junkyard.

Thanks again for the quick and helpfull responses,

Matt

The fuel circuit runs all through the harness, you will need a wiring diagram to properly hunt down the trouble. It's safer to use the factory setup as it will shut down the fuel pump if the engine dies, But for testing you can disconnect the power to the fuel pump and run a hot wire directly to the fuel pump. With the jumper wire in the truck should run fine.

When do you hear the fuel pump running? You can't here it when the truck is running and the factory harness turns the pump off when the engine stops turning over. Are you holding the air flow meter open to get the fuel pump to switch on?

So have you had this thing running since you moved the tank but before it rained?

Make sure your throttle position sensor is plugged all the way in and working correctly. My buddy had an identical problem in his early celica. We changed the fuel pump, didn't help, then I started checking other stuff and found that his TPS harness plug wasn't fully seated. Shoved it in the rest of the way and it's been fine since.

It ran once since I moved the tank. I let it run for about a two minutes and ever since then, it hasen't run.

As mentioned...check the fuel pump power to make sure it
still has voltage when you let off the START key position.

Maybe during your tank move you dislodged some debris
in the tank that could have caused a clog????

Jay

UPDATE:

I tried Chris' idea of running the wire from the bat. to the pump and here is what happens.

The truck will only run for about 3 seconds now but, if I hit the gas it will keep on running. I took it for a test drive around the back yard and it hardly has enough power to move with the dual cases in and it can't move at all in normal 4WD.

Could it be the fuel pump?

BTT

Don't forget to make sure it has a Fuckn ground

Yeah, recheck the ground and if it still doesn't work, the next thing I'd change would be the fuel pump itself. Obviously, you don't want to change the fuel pump, but I suspect the board is collectively out of other ideas besides what we've already suggested.