I bought a 1984 Corvette about 6 months ago and a buddy and myself have been working on it. Currently we are not getting the Fuel Pump to work. We have replaced the master relay, ecm, sending unit, and have checked the fuse box. Enough volts are getting to the connector that goes into the pump but still won’t work when connected to the pump. We have no idea what else to do.

 

If you are getting voltage to the pump connectors and it still not working Id pull the pump from the tank for inspection and bench testing.

 

Wow, this is like the 5th post this week from new members with fuel issues... I guess these cars are starting to reach that age. I myself had fuel issues (as the main issue with my 84 Corvette), and it's why I got it so cheap too.

You said you replaced the sending unit... did you also replace the fuel pump when you had it out of the fuel tank? If you can verify that power is getting to the pump (as in the connector just above the sending unit has power), then it's definitely the pump.

For what it's worth, the 1984 has a specific fuel pump that provides 12-14 PSI for the Cross Fire Injection system... the L98 which replaced it (basically, the TPI motor), went with a higher fuel pressure to align with its MPFI system that many of the GM cars started getting in 1985 and later. The higher pressure is around ~42psi... which is quite a bit more than what your Cross Fire Injection system needs. You can still order the 14-PSI pump because it's the same pump used on almost all GM TBI motors, so it's readily available. Some people say to go with the higher PSI fuel pump, but I opted to go with the stock 14 PSI. Your factory fuel pressure regulator should be able to handle it... but keep in mind you're tripling and nearly quadrupling the fuel pressure... so things like the rubber diaphragm in your TBIs and the old fuel hoses that are on the car now might spring a leak. If you choose to go to the higher PSI one, maybe someone who's done it can offer some pros / cons to it.

 

proper volts does not always mean proper amps. Try connecting a spare battery/charger direct to the fuel pump (by passing car's wiring) and see if pump runs. If not replace it. If it does start checking wires and grounds. Somewhere something is loose or broken.

 

I forgot to mention it but I did try connecting it straight to the battery and it did run. I guess I’ll start checking wires.

 

Ooooh, that's interesting. Might be an immobilizer issue, but I am not super familiar with the 96 cars.

 

I bought an immobilizer on a 2006 Pontiac Solstice that I picked up in December of 2005 back in the day. It was a dealer-option... and it required me to push a button before I could start the car. I realize in hind-sight how lame something like that is. It made sense in my head, but I can only imagine what the current owner of that car might be dealing with right now... :/