Re: Spitting, leaking fuel pump


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Posted by David Sherman on Thursday, July 02, 2009 at 20:33:26 :

In Reply to: Spitting, leaking fuel pump posted by B-o-b on Thursday, July 02, 2009 at 16:58:10 :

The hole is there so that when the diaphragm goes bad, the leaking gas will go out the hole instead of into the crankcase (in theory). Every old truck or sno-cat I've bought has needed the fuel pump rebuilt within a year of running it on modern gas. Don't know if it's the alcoholic gas or the age of the pumps, but they all need to be done. I get my kits from Then & Now Automotive -- not cheap (~$30), but the guy will always take the time to talk to you and make sure you get exactly the right one for your pump. All kinds of different pumps fit on 230s. Auto parts stores no longer have fuel pump rebuild kits. The trickiest part is getting the feel for un-hooking and re-hooking the actuating rod onto the end of the lever. You have to do it by feel because you can't see where it hooks. That's assuming it's an AC pump. Carter pumps have a whole different scheme -- you have to pull a pin and take the lever out, and you need a special too to press out the check valves.

One tip is when you have it apart, lap the mating surfaces of the castings so they're flat. The easy way to do that is lay a full sheet of sandpaper (200 grit or so) on a hard flat surface like the top of your table saw and rub the casting flange around on it until there's a complete ring of freshly-ground metal showing. Over time, the metal flows and the holes get pulled closer together. This makes it harder to get a leak-proof seal on the diaphragm even when you tighten the screws down hard. The light lapping is quick and easy and makes for a better rebuild.



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