fuel pump

Anonymous-0 · Jul 15, 2012

I have a case 4690 ,I need to pump up the fuel pump with the prime pump every day before i start it. What is causing the fuel pump to loose its prime.Thanks for any help.

JDseller · Jul 15, 2012

You have an air leak in the system some where. It is allowing the fuel to bleed back over night. You can have a leak that will leak air under vacuum but not fuel under pressure. I would first check all the fittings/lines to see if any are loose or need new seals. If I remember right those Case fuel systems use a rubber compression washer on the low system side. These can get hard and just need to replace the rubber.

If you can't find the air leak then install a check valve at the fuel tank. This will keep the fuel from bleeding back. JD combines have them at the fuel filter on the back of the motor, Older hundred and twenty series. They are about $40 new or you can find them on a junked machine.

c.hess · Jul 15, 2012

Sounds like a small leak somewhere in fuel line--filter seal --bleed screw on filter .Crack screws open when running an make sure they are free of air.If air is in them again when you start another day there is leak in fuel line from tank.Might also check at bottom of tank an make sure no restriction there.

mark in boonville ny · Jul 15, 2012

mine would do that too if it got under 1/3 of a tank it would loose its prime if it sat for a day or 2 with out being ran but i never did fix it before i sold it.

fuel pump

Anonymous-0

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JDseller

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c.hess

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mark in boonville ny

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