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Old 26-09-2020, 01:31   #31
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Re: Fuel feed pump issue OR not?

^^ nice repair and thanks for posting it. I always like to hear about effective DIY repairs.
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
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Old 26-09-2020, 17:16   #32
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Re: Fuel feed pump issue OR not?

Originally Posted by Dieseldog View Post
Well, there's more than one way to fix a knackered fuel pump.

The new pump diaphragms that I ordered from USA could take months to get here (Tasmania) with the postal system in Covid overload. Meanwhile summer is on the way and a want to use the boat. So I just replaced the flexible membrane on the old diaphragm. The nitrile material came from an ebay supplier in Australia.

Pump diaphragms usually aren't made to be taken apart, and this one is no exception. The end plate was held on by the end of the shaft being peened over. I had to machine the end off the shaft to get the old diaphragm off. But that left me with a shaft that was too short to reassemble. I thought about making a whole new shaft, but then had another idea that was worth a try. I built the end up with weld metal and turned it back to the original diameter. Re-fitted the diaphragm plates with the new membrane between them and peened the built-up end of the shaft over again with a ball-pein hammer. It worked quite well. Diaphragm is held nice and tight on the shaft and the pump now pumps again.

Good job cobber!
I like the way you are thinking
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Old 28-09-2020, 21:39   #33
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Re: Fuel feed pump issue OR not?

Reinstalled the pump on the engine today and gave it a test run. All good. Engine runs at full power and doesn't piss fuel out of the drain hole on the underside of the pump. Works just like a bought one!

If anyone has a similar problem, I'd encourage you to have a go at fixing it with a new membrane. Here's the Australian supplier I bought the diaphragm material from (not ebay as I previously stated. I was confusing it with another purchase):
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