csalerno
Well-Known Member
The mech fuel pump seems to sometimes work, sometimes not work.
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Poor engine performance
- Thread starter csalerno
- Start date
crane operator
Senior Member
Wouldn't it be easiest to just suck fuel from a clean bucket and a line first, to see if the pump is actually working, and then to chase down fuel line issues? Is there some reason you installed a new fuel pump? Those mechanical fuel pumps are pretty simple, and aren't usually a problem.
Are you saying this because you know the shaft that drives it isn't turning, or that you don't see fuel being returned out of it?
Are you saying this because you know the shaft that drives it isn't turning, or that you don't see fuel being returned out of it?
Ronsii
Senior Member
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- Jun 26, 2011
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- Western Washington
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- s/e Heavy equipment operator
This is one of the first things I do when tracking down fuel issues that don't seem right... I also made up a clear hose and attachment fittings so I could track down just where air bubbles were first appearing in the system
this little tool has come in very handy quite a few times not just with my own equipment.Maybe just give us a hint on who made the machine
the info could make figuring it out a whole lot easier Certain pieces of machinery have their own problematic traits and fixes
kshansen
Senior Member
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Agree I'd be trying to confirm if the pump is turning. One simple test would be to as crane operator says hook a hose to the suction side of the pump and stick it in a bucket of clean fuel and then have a hose coming off the output side of the pump running back to the bucket. Then crank the engine over. It should pump a steady stream of fuel after a few seconds cranking. You could get all fancy and after you have flow of fuel connect a presure gauge to the ouput port and crank over some more, should be able to pump around 60 psi.
As for how the pump works it is a simple two gear gear pump that is driven directly off the shaft in the governor any time the engine turns the pump should turn. No hydraulic drive or in/out clutch.
I'd be more thinking a plugged line or fitting in the tank or a suction leak in the line from the tank to the primary filter, the filter housing itself or the line from primary filter to the pump. That's why crane operator and others like myself are saying to do a test by eliminating everything up to the pump on the suction side.
Those gear pumps are very tough, we used them on shop built washstands for years and they would pump dirty solvent for years with out a problem. So unless you have an extreemly dirty water contminated fuel system it shoould work just fine.
csalerno
Well-Known Member
Thank you, I'll try that and report back.
csalerno
Well-Known Member
I pulled the fuel pump yesterday evening and found that the box tubing coupling is too short and unless in the very middle of the drive shaft from the governor and the shaft of the pump it un-couples and the pump is not spinning. The coupling was provided in a rebuild kit about 3 - 4 years ago. I have to figure out a way to properly space it.