Lift pump dropping fuel

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Wheelie
Posts: 59
Joined: Mon Oct 30, 2017 8:42 pm
Location: Ireland

Lift pump dropping fuel

Post by Wheelie » Sun Feb 10, 2019 8:37 pm

Hi would anyone have a reason why diesel is dropping down in the lift pump glass bowl,it's full when engine is running but diesel level drops down to half way about 5 mins after stopping engine,it starts fine and doesn't seem to be any air in system when running,it's a new lift pump and was fine for a few months,and doesn't look like there's a leak anywhere,thanks

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db2d
Posts: 1970
Joined: Fri Feb 24, 2012 10:01 pm
Location: Monmouthshire

Re: Lift pump dropping fuel

Post by db2d » Sun Feb 10, 2019 10:28 pm

Can you please give the tractor model.
If the valves in the lift pump are defective the fuel can return to the fuel tank if the tanks are under slung. The diaphragm can also be defective. If the pump is defective fuel can leak into the engine oil.

starider
Posts: 35
Joined: Wed Aug 15, 2018 11:14 pm
Location: DEVON

Re: Lift pump dropping fuel

Post by starider » Sun Feb 10, 2019 10:59 pm

Hi,one thing to check,make sure the filter glass bowl is seating properly i.e. the rubber sealing ring is OK and that the but knurled nut is tight[do not over tighten]...................starider

Wheelie
Posts: 59
Joined: Mon Oct 30, 2017 8:42 pm
Location: Ireland

Re: Lift pump dropping fuel

Post by Wheelie » Mon Feb 11, 2019 5:32 am

It's a 1490,ok will check that again thanks,it does seem to drop to the level where the diesel enters inside the glass bowl itself

Wheelie
Posts: 59
Joined: Mon Oct 30, 2017 8:42 pm
Location: Ireland

Re: Lift pump dropping fuel

Post by Wheelie » Mon Feb 11, 2019 3:57 pm

Just some more info,I don't know if this is usual but when the bowl was full I loosened the diesel intake pipe at the lift pump and the diesel ran out down to the level it was dropping to,maybe it would do that anyway?

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ollek
Posts: 3612
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: Lift pump dropping fuel

Post by ollek » Mon Feb 11, 2019 4:08 pm

The valve on the intake side of the lift pump should keep the fuel in the bowl, even if the pump intake pipe is loosened. Dirt from the fuel tank can get its way to the lift pump and get jammed in the intake valve, making the fuel leaking back into the tank.

Wheelie
Posts: 59
Joined: Mon Oct 30, 2017 8:42 pm
Location: Ireland

Re: Lift pump dropping fuel

Post by Wheelie » Mon Feb 11, 2019 4:23 pm

Ah right thanks for that sounds like the problem, because there was some dirt in the bowl but never seen it happen before,took off bowl and cleaned around sure see what happens this time, would that lead to air getting into the system though?because it will start and run no problem

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ollek
Posts: 3612
Joined: Tue Apr 10, 2012 1:20 pm
Location: South West Finland

Re: Lift pump dropping fuel

Post by ollek » Mon Feb 11, 2019 5:30 pm

Leaking lift pump valves will not let any air into the system.

Wheelie
Posts: 59
Joined: Mon Oct 30, 2017 8:42 pm
Location: Ireland

Re: Lift pump dropping fuel

Post by Wheelie » Mon Feb 11, 2019 9:06 pm

Right thats good anyway,might just replace with another new one sure,don't want any leaks into the oil thanks good info

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