Mitsubishi L200 fuel
Variant: pickup
Model Year: 2001
Categories:
Engine & Drivetrain
why does my truck suck air into the system when the tank is half full or less and going up hill, if I keep the tank over this there is no problem, the tank has been out and the pickup pipes replaced and the breather filter is new, it has now been to 5 garages and still has the problem. the fuel system has been pressure tested and the tank gauge is correct
Posted: Jul 15, 2015 (9 years ago)
Check that the fuel pump is working correctly.It sounds like the fuel pump hasn't the power to push the fuel system when half full and when the tank is full gravity is giving it a hand.
Posted Jul 16, 2015 (9 years ago)
All I can suggest is what I would do,
Using a hand operated vacuum pump isolate sub systems,
Like the fuel filter,
blanking off the inlet then vacuuming it to the max the pump,
i.e. 15"
and check for holding.
same with the tank then the lines then the pump.
Just a systematic test on smaller sections will make isolation easier.
The air has to be drawn in somewhere.
The other suspect is a little more difficult to test,
the injection pump itself.
this can be vacuum tested but will need blacking nuts for the output to the hard lines.
or a second set of lines cut off at the gland nuts and plugged with rubber tubes/plugs.
.But a first test as stated is the filter/housing,
open it up and check that it is full,
not half full,
The biggest demand for fuel is when heavy loaded going uphill.
So if the filter isn't full the injection pump will generate high vacuum in stead of pulling fuel the vacuum will suck air in from any faults.
Using a hand operated vacuum pump isolate sub systems,
Like the fuel filter,
blanking off the inlet then vacuuming it to the max the pump,
i.e. 15"
and check for holding.
same with the tank then the lines then the pump.
Just a systematic test on smaller sections will make isolation easier.
The air has to be drawn in somewhere.
The other suspect is a little more difficult to test,
the injection pump itself.
this can be vacuum tested but will need blacking nuts for the output to the hard lines.
or a second set of lines cut off at the gland nuts and plugged with rubber tubes/plugs.
.But a first test as stated is the filter/housing,
open it up and check that it is full,
not half full,
The biggest demand for fuel is when heavy loaded going uphill.
So if the filter isn't full the injection pump will generate high vacuum in stead of pulling fuel the vacuum will suck air in from any faults.
Posted Jul 16, 2015 (9 years ago)
I sounds like a problem with the suction control valve in the pump
Posted Jul 16, 2015 (9 years ago)
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