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Old January 31st, 2019, 03:53 PM
Clarke Clarke is offline
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Join Date: Jan 2013
Location: Eureka Springs, AR
Truck: 1962 1500 Wideside 4 speed (305D / SM-420)
Posts: 217
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Default Re: 1966 And Later Fuel Pumps

Quote:
Originally Posted by ilvracn View Post
i still had my old pump laying on the bench from this summer when it went bad. i decided to take it apart, and see what went wrong. one of the check valves fell out. i was driving at hiway speed, i think the vibration from 3400 rpm probably vibrated the valve from it's seat in the pump. diaphram looked excellent. looks like manufacturer defect, should have been staked in.
Interesting... Did the engine die on the road or did it still run?

The first several that went bad on me, I took apart and they had a small tear in the rubber diaphragm towards the outer edge just inside the body flange. I’m assuming this due to having a hard point/edge that the diaphragm is repeatally flexing against? The pumps still worked with tear, but leaks oil from weep hole and I’m assuming you risk getting gas in the crankcase if you continue driving. Luckily, none have left me stranded.

Thanks for sharing.
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