Dragging up this antique thread about noisy mechanical pumps I started. Vid was removed sorry.
Had the same issue recently but this time with a large canister Carter pump on a stock 400.
When I first installed the pump it was quiet, but slowly but surely a noise returned.
Zero mile engine.......at about 200 or so miles I can start to hear that telltale whomp-whomp-whomp sound at idle.
At 520 miles it got so loud I couldn't take it any more and took it out. The damn arm was so sloppy and loose it almost felt like it was going to break soon. When I operated the pump by hand in a vise it honked so loudly I thought I was going to attract geese. Covering the intake port of the pump with a rag slightly quieted it down a little but this was obviously the sound I was hearing at idle.
Replaced the Carter pump with a Delphi unit that uses a spring under the arm unlike the Carter which had nothing.
I can still hear the whomp-whomp sound at idle very faint but it's not offensive. I guess it's just the nature of the beast with mechanical pumps but the Carter was a total piece of crap. Operating the Delphi pump by hand had no noise.
Hopefully the Delphi stays quiet,time will tell.
I wanted to use a NOS Delco pump but I am afraid the diaphragm isn't compatible with today's fuel and will disintegrate over time.
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