Hello gentlemen. Like the rest of you losers I worked on my GT this holiday, sorta a gift to myself. The problem is my fuel pump, what a surprise. I removed the existing and installed a new one, no sweat. However the new one does not work. I did the jump thing with a 12 volt battery and no use. I checked the continuity from the jump to the plug in the engine compartment, good continuity. Therefore I suspect a ground problem at the tank.

The question is can I just connect a 12 volt flashlight battery to the pump terminals to check the pump first? If it does I am going to replace the wiring from the plug to the tank.

Again thanks for your help guys and happy holidays.

Matt

Matt, Did you remember to plug in the connector 1/2 way up the firewall--and you tried the jumper trick at the aldl connector , using the orange cigg ligther wire as a source for power.

Check the fuel pump fuse and the relay to make sure the pump is receiving power. Good luck!

quote Originally posted by 3800superfast: Matt, Did you remember to plug in the connector 1/2 way up the firewall--and you tried the jumper trick at the aldl connector , using the orange cigg ligther wire as a source for power.

Oops? Just kidding yes I did. I dont like to use the cig lighter to hot wire. Last time I blew a fuse. So I was using a 12 volt flashlight battery at the aldl connector. I removed the tank and pump again and I am going to hot wire across the pump terminals themself today.

Thanks for you help

Matt

I think it would just require 12 volts and a ground---but not sure I would want to do it out of the gasoline for very long , as it cools the pump, also I`d want a relay, fuse ? or something in-line to protect it.

quote Originally posted by 3800superfast: I think it would just require 12 volts and a ground---but not sure I would want to do it out of the gasoline for very long , as it cools the pump, also I`d want a relay, fuse ? or something in-line to protect it.

Exactly what I was thinging, too many amps across the terminals will fry it, hence fuses. Maybe I have to do the cig lighter trick.

Thanks,

When I ran my injector tester I just connected it right to the battery without problems. A fuse would be a very good idea but you can test run them without one. (a lantern battery might not have enough output to run the motor they take a couple amps) You also want to make sure you connected the polarity right. Depends on the build of the pump, but since it's a bush DC motor it will run in either direction. Depending how the pump is made it may or may not pump fuel in either direction. Check the docs that came with the pump if you have them.
If you are just going to see if it turns then a quick pulse won't hurt it, but dont run if very long the fuel also lubes the pump.

quote Originally posted by Dodgerunner: When I ran my injector tester I just connected it right to the battery without problems. A fuse would be a very good idea but you can test run them without one. (a lantern battery might not have enough output to run the motor they take a couple amps) You also want to make sure you connected the polarity right. Depends on the build of the pump, but since it's a bush DC motor it will run in either direction. Depending how the pump is made it may or may not pump fuel in either direction. Check the docs that came with the pump if you have them. If you are just going to see if it turns then a quick pulse won't hurt it, but dont run if very long the fuel also lubes the pump.

Thanks runner, I was going to use a latern battery, but like you said maybe not enough amps. Any other source I can try?

Matt

Do you have continuity from the ALDL plug fuel pump connection to ground.

If so I'd use a 6 ft wire to the aldl and touch to the battery if you don't want to use the Cig. lighter.

quote Originally posted by mmesko: Does anyone know a way of testing the fuel pump before installation? Matt

Well....sorta. Once I reinstall the pump in the tank (don't run it dry), I hook a fuel pressure gauge to the pressure line and momentarily deadhead the pump up to about 45 psi while the tank is still sitting on the ground. I use a spare car battery to energize the pump (with long wires to keep the sparks away from the tank). I basically hook a "T" fitting between the pressure and return lines, and run the third outlet to the gauge and pinch off the return line with a pair of vice grips.

Works great. I also had one incident where the pulsator blew out at about 40 psi. I replaced it with a piece of fuel line and redid my test. All was well, so back in it went. I was VERY glad it did while the tank was on the ground. Dropping a fuel tank isn't rocket science, but at my age, it isnt' fun either.