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Old 11-22-2008, 06:56 PM   #31
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I am not a fuel pump expert either, but the fuel pump has diaphrams in it that move when the pulse line pushes air into it, thus causing the diaphrams to move causing the pumping action.
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Old 11-22-2008, 07:17 PM   #32
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<div class='quotetop'>QUOTE (BSH-PQR @ Nov 22 2008, 07:45 PM) <{POST_SNAPBACK}></div>
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<div class='quotetop'>QUOTE
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If you take the lines off the carbs and try to pump into a tin can you can quickly eliminate the pump being the problem. Just because fuel isn't going into the carb, the problem can still be in the carb.[/b]
It does not need to be hooked up to the carb? The impulse line pushes air into the fuel pump, and the suck from the carbs creates the pull. Creating a vacuum????? I am sure I am wrong, but I thought that is who it works.
[/b][/quote]
As far as I know the fuel pump just pushes.
I did this on a 87 yamaha I got for free. Sitting a few years out on the rocks, and a few animals made a home of it, the carb was plugged solid. I took the fuel line off the carb and had no problem pumping fuel into a can. I knew my problem was in the carbs, and it turned out it was.
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Old 11-23-2008, 10:26 AM   #33
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Gas pumps into a can. THANKS. Not the fuel pump.

Here is the problem> Took the carbs off this morning. Everthing was pluged with some green sludge. Piolt jet as well as the piston valve and needle. All the brass was caked with it as well. ?????? One side was worse that the other. I have them soaking right now.

I just cleaned them. Any thoughts? Bad gas? Another culprit> I (like and idiot) put a screen over the weight on the end of gas line in the tank. When I took the line out yesterday it was deteriating and green. Thinking about it, I would assume that the fuel filter would block small piece, but could the broke down metal be mineralized so as to pass thru the filter in the gas>then built up on the parts in the carb?
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Old 11-23-2008, 08:01 PM   #34
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Cleaned carbs. 10 pulls, started right up. Thanks for all the chat.

Still wondering about the green build up.(See above post).

Thanks again.
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Old 11-23-2008, 08:38 PM   #35
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green buildup is/was fuel varnish in mid to 3/4 development stages, hopefully you got all of it out of your jets or else severe piston/cylinder damage can (will) more than likely result,, if it feels flat under full throttle pass,, do not continue to run until having it professionally done or going out and getting some Hydroseal II to soak all jets in to loosen and flush out varnish rest of way
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