1974 Duster

DionR said

I had a noise from my fuel pump area, too. I'm running a magnum roller in my early block with hughes lifters and fuel pump eccentric adapter, so pretty similar to your setup. I replaced the fan clutch and alternater, before I figured out it was from the pump. Pulled mine and replaced it, which made no difference. In the end, what I found was that the pump arm was rubbing on the timing chain.


No idea why it would show up later, though. Maybe it's a completely different problem.

Click to expand...

You called it. (see picture)

I pulled the belts off the car (no change) then fired it up with the pump out, the noise was then completely gone. I'm thinking that the reason the noise showed up after a year was due to slack building up in the timing chain as miles accrued on the engine. The slack in the chain lets the cam move back and forth further in the block striking the pump.

Back in the day I use to have either a Carter or Holley pump with a thin arm with a pad on the end, I suspect that extra clearance would make the problem go away. In my case I'm going to simply run an electric pump and change out the mild roller cam with something with a bit more bite while I'm at it.

BWHAHAHAHA! When handed lemons, make lemonade.