Fuel pump not working properly?

Hi,

The fuel pump is mechanical and not electric (unless someone changed it). It won't pump fuel until the engine is turning.

Let me know.

Joe

Hi,

You are correct. Sorry about that. They did have ones with mechanical pumps as well. It seems so odd to think of a 1978 that was fuel injected. It was very cutting-edge for the times.

Okay, when the key is first turned on, the pump should run for a couple of seconds. I believe that is where you are having the issue. Power is provided by a timed relay that energizes the pump for a short time. Once the vehicle is running, power is supplied via the starter solenoid.

Now here is my problem. Because of the model year, I have no wiring schematics to tell you where to look for the relay. It should be close to the fuse box. That is where I would start checking. Locate the relay and remove and inspect its connectors. Also, here is a link that explains how to test a relay:

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

See if you are able to locate the relays. Again, sorry I don't have the schematics or fuse panel legend.

Let me know.

Joe

Hi,

Thanks for the schematic. That is extremely helpful, and I know for sure it will help others in the future.

Take care and thanks again,

Joe