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I agree with Tom but only do one swap at a time (archive)

[ Follow Ups ] [ 2002 Message Board ] [ Msg. Board FAQ ]

Posted by Nelson on June 27, 2001 at 13:26:37:

In Reply to: Re: the k-fisher posted by Tom on June 26, 2001 at 23:30:16:

Have you tried swapping valves? That is the quickest way to troubleshoot them.

By your description, I'll redefine these so I don't get confused:

float valve = suction valve
thrust valve = delivery valve

I used a modified aluminum cotter pin to safely remove the suction valves out the top of the k-fisch - very slight "L" shaped bend on one end. If the problem moves to the cylinder that you moved the questionable valve to, then the problem is the valve. I had the luxury of taking off the black plastic tube on my early '72 to see if the cylinder was getting fuel or not. Much more difficult on later models (you can crack the line at the injector as a test also).

Try the suction valves first, followed by the delivery valves, and if that fails, try the injector on that cylinder. I had to replace my pump before after exhausting the possibilities, but it had sat for years. I worked with it for several days until I was sure that the pump was the only thing left to replace.

It's very tedious, sorry, and the part very fragile and expensive to replace.


OK i figured out that my #2 cylinder isn't getting any gas. i took out and cleaned the float valve and the thrust valve (the one below the plastic fuel line). cleaned them with carb cleaner. even ran a thin wire up the canal that seems to connect the two.
when i crank the engine with the hex bolt out (the one over the float valve) i get plenty of gas coming out but nothing comes out of the the thrust valve - something is not working between float and thrust valves.
what's next? I'll have to try to figure something out for tomorrow nights work.
i'd appreciate any suggestions from anyone out there.
72tii (with a cranky k-fisher)

To isolate the problem you should only make one swap and then see if the problem moves (eg; swap a pair of suction valves and check results, if no affect then swap a pair of injectors and re-check results).

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