View Full Version : How to quiet fuel pump?

04-26-2007, 06:15 PM
Ted H's response to pitbullady made me think about this subject again... how *do* you get rid of a fuel pump knock? I have tried both a rebuilt (by me) R1 fuel pump and a NOS but kitted '55 fuel pump on my R1 engine... both knock. Both did it with the engine only on a stand and a hose in a gas can. The '55 fuel pump was quiet on the previous engine (a '63 standard 289.) Is there anything I can do or am I stuck with an engine that is basically good but sounds like it has a rod knock? I'm *this* close to just spending the $$$ and converting to an electric pump.


55 Commander Starlight

dave smith
04-26-2007, 06:47 PM
try installing pump with extra gasket and see if it gets better or worse good luck

04-26-2007, 10:43 PM
How about putting the pump arm in a vise and just tweaking the end of the arm that rides on the cam 'up' a bit. It shouldn't take much.

Tim K.
'64 R2 GT Hawk

Dwain G.
04-27-2007, 02:04 AM
The old dual diaphram pumps were more known for making a knocking noise. Pump noise is usually due to weak/broken springs or wear in the pivot points of levers and links. When we used to rebuild them I was taught after assembly to pack the cavity with heavy chassis grease.

Dwain G.

04-27-2007, 04:33 AM
The copies of old installation instructions for fuel pumps, that come with kits from "The Cellar", say to grease the linkage or immerse it in oil before installing the pump; or a knock may result. But, I've never done anything special.
Old VW Beetle pumps had a plate, held in place by two small screws, that covered a chamber you were supposed to pack with grease.
Mike M.