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What part(s) fail in a mechanical fuel pump?


Guest Anonymous

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Guest Anonymous

I have taken the mechanical pump off my '76 non-tii Weber 32/36 setup. I tested it manually with the "gas in the jar" method. It appears to be working. The next thing I would like to know is could the pushrod be worn down and not supplying enough fuel pressure? Will the rod come right out once I take the pump off again or do I need to take the valve cover off to get the rod out? Can I just buy a new pushrod or is it included when I buy a new fuel pump?

Any thought anyone?

TIA,

Chuck

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Guest Anonymous

As for what parts wear, the Rubber diaphragm is what gets old and brittle, it will eventually get small cracks in it that leak fuel into your motor oil, and eventually Causes sever inner damgae, if you dont change it iimediatly. I have never heard of push rods wearing down, but I guess it would be possible because of the metel to metel contact.

HTH

Andy Rattley

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Guest Anonymous

then the problem may well be a worn pushrod and/or a worn pad on the fuel pump itself. The pushrod should be square at both ends; if the pump end is beveled, it's worn.

Also check the pad on the fuel pump that the pushrod strikes. I've had one wear all the way through so the pump wouldn't operate any more. Being cheap, I removed the pad from its pivot pin, welded it up, filed it down smooth and reinstalled it. Works fine now! And FYI, the "sealed" fuel pumps as fitted to the later cars use a different length pushrod than do the rebuildable pumps (put together with screws) originally used on the 1 bbl cars. Use the wrong pushrod and either the pump won't work, or it'll be ruined.

Cheers

mike

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Guest Anonymous

Father-in-law told me about doing the same thing on tractors 40 years ago. How much did you weld on/file down? Could I try JB Weld first?

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Guest Anonymous

higher than the original, the ground it down on a grinder. Of course remove the part from the fuel pump first! JB weld won't work--not nearly strong enough to take the pounding of the pushrod.

Cheers

Mike

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