Festy down

[drddan]

Went to start the GL today. It started , but ran rough, then died. Turn key and started again running rough, then died again. Turn key, and now just cranking, no start. I suspect fuel pump or its relay.

Anybody have suggestions for easy check to diagnose this problem?

Thanks

[bravekozak]

Spray a blast of quick start in the carb.
If it starts and runs for a couple of seconds, then its your fuel delivery.

If its EFI, do you use non-ethanol gas in the winter?

[drddan]

Ha ha! This is the GL - EFI. No carb

Trying to find the fuel pump relay location to check B4 I buy a fuel pump. All fuses look good in fuse panel and I have good fuse cartridges in the link box by the shock tower.

[SoCalZ28]

how many miles are on your fuel filter? is there a port/valve to check fuel pressure at the rail?

[drddan]

There should be a valve. I have to look. FSM says there is. 153,076 miles on odometer

Searching for a pic of the fuel pump relay. What does it look like? I want to check the relay. Not hearing the pump run, but there are several things that can cause it not to run

[Damkid]

I check fuel pressure the easiest way I know, turn the key on and then back off to pressurize the line, then pull the fuel off the rail, if there's pressure the fuel will squirt out relieving the pressure in the line

[1990new]

My Electrical and Vacuum Troubleshooting guide says the Fuel PUmp Relay is mounted on the left side of the instrument panel to the left of the PCM.

[drddan]

Thanks Jess! Do you know which connector it is that you jump to make the pump run? I see this all the time on the forum, but cant find it for the life of me. Is it the white single connector, or black single. I jumped the double black connector and it made clicking noise. I suspect pump is bad, but want to verify

[shadetree]

Finger the vaf first . If it's a five speed try to start without pushing clutch in , pump still runs . If it's not running raise the back seat and remove access panel and peck on top tank , jump start it .

[Studebaker]

Check for spark by grounding a spark plug and cranking. Two person job.

Remove air filter. Flapper inside of vaf if you hold it open you should hear the fuel pump click on. This is with the key on. With The flap open spray in a good amount of starting fluid. See if it runs. May have to crank for a min or two before starting fluid gets into combustion chamber.

[1990new]

Thanks Jess! Do you know which connector it is that you jump to make the pump run? I see this all the time on the forum, but cant find it for the life of me. Is it the white single connector, or black single. I jumped the double black connector and it made clicking noise. I suspect pump is bad, but want to verify

Yes it is the black double connector shown here:


The fact that it clicks doesn't necessarily mean that it is not bad.
It could be trying to trigger the switch on but the switching contacts could still possibly be burned internally.
The true test is to remove your back seat and the fuel pump cover and check for power at the pump connections.
If you have power (with the pump triggered) there and the pump is not running, it's your pump (or pump connection). If you don't have power there (with the pump triggered to be on)
then it is your relay or you have a break in the power or ground to the pump.
If you pump is running, it could a blockage somewhere.
Do you have a spare pump?

[drddan]

A lot of suggestions here! All good!

I went out and turned the key to run, smacked the tank bottom with a hammer. Pump did not start. I will go get the multimeter and check volts at pump and have my plastic mallet with me to tap on top. It freakin cold out side. Sun went down and temp dropped. This may have to wait til Saturday to continue

[itstock]

Have you checked voltage at the T check connector? Check to see if you have voltage. If you do, the main power relay works. That is by the headlight. The next step is the fuel pump relay, location left side of of the car, under the dash. The relay is black with yellow. The wire you are testing is the yellow w/ black stripe. Next would be the fuel pump itself. You could pull it out and apply 12 volts to it directly to see if it works. That is the whole electrical for the fuel pump. Holler if you get stuck on anything.
BTW, buy a new fuel sock if you are going to pop out the pump. $14 at the parts store, just go insurance for the future.

Chad

[drddan]

Pumps wear socks?! J/K

For sure about the sock. $125 pump and $15 sock. In stock at Oreillys and AZ. What is the T check connector? If I know where and what it looks like, I can check it with my meter.

[itstock]

It is in a group of connectors by the brake booster. It will not be plugged into anything and it will look like a T. Put the posi lead in and the neg on the battery ground. turn the car to run. Should get 12 volts. if not. Look at the main power relay by the headlight. More than likely that went bad.

Chad