Gravely 8123 fuel starvation

mrdavidj

New User
Got a 1984 Gravely 8123 that I have owned since new. Recently it started to have a fuel starvation problem when it the motor gets hot. :?: It has a Kohler K301, which has been rebuilt once, has a new fuel tank (plastic), new fuel line, and a new fuel pump. When it first started to do this, I figured the original pump was finished, so I got a new one. Seemed to make a difference for a few days, then started again. When it quits, I pull the riser hose from the pump to the carb, and each time there is no fuel. I can crank the engine, and no fuel comes out, so pump is not working. If I pull the hose on the inlet side of the pump, there's fuel. So I'm pretty convinced it's is pump related.
Anyone know why the pump would quit when it gets hot, then work fine when it cools? The motor is getting ready for another rebuild (compression getting low), and it does run a little hot, but why would this cause the fuel pump to quit, and is there a temp solution?
Thanks.
Dave.
 
Don't those pumps work off of a little rod pushing on them ? could it be pretty much worn out ?
 
(quoted from post at 19:55:53 09/06/08) Don't those pumps work off of a little rod pushing on them ? could it be pretty much worn out ?

Pushrod is part of fuel pump assembly, and is new with the new pump.

As for the gas cap, I've tried running it without a cap, no difference. Besides, there is flow on the upstream side of the pump.
 
If pump a pressure operated pump check or replace hose from pump to crankcase,same may be age hardned & have hairline crackes in same,when eng gets hot hose may expand letting air into line,or hose may loosen up on nipple at eng when hot allowing air into line,also check that crankcase breather valve is working & not plugged up,if pump a mech pump kohler recommends screwing in & out nipples into body 6 full turns with thread sealant on threads,you may be sucking air on 1 or both nipples,also make sure when you installed pump you have pump arm on top of cam & not under cam
 
Gravely parts Richards lawn and Garden the specialize in old Gravely 1800-827-4551 in WV

There's also a place in NH I am trying to find the name now
 

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