ok so now I understand why everyone wants to put a 350 into a chevette. Because the stock fuel pump is HELL to service.

So on my 78 'vette:

I sold it for $100 plus yard care for two years, to my brother in law. I recently bought it back and it doesn't run.

They had put a new carb on, but it still wouldn't run right.
First thing I noticed wS the electric fuel pump, so I checked the specs, and its pressure is excessive for a sock carb.

SO, o got a NOS pump and put it in.

Some enginerd needs to be slowly cooked on a spit.

To access the pump I pulled the power steering pump bracket and removed the oil filter. The top bolt is barely accessible with a stubby non-ratcheting wrench. Not enough clearance for a ratchet wrench. 1/8 turn at a time, luckily the bolts are short.

So I put in my NOS pump, having verified the action and which port is intake.

No fuel to carb. Multiple prime attempts, will start and run until the primer slosh runs out.

So, I pull the pump, and decided I must have not assessed inlet correctly. Swapped the lines.

No help. Still no fuel to carb.

Absolutely confirmed fuel to pump.

So now what?

Old pump diaphragm was confirmed bad. I doubt the lobe is worn off the cam but it's possible.