91 FORD 1720 Fuel Problem

dpendzic · Jul 8, 2022

My tractor starts and runs good for 15 minutes then starts dying out and stalls--figured it was a fuel delivery problem so topped off tank, changed fuel filter, checked flow to filter, checked tank vent and still not fixed. it will run until it stalls,let sit for a few hours and will start up and run for a few minutes--is there a hidden fuel screen somewhere that may be plugged?
its a Shibaura 3 cyl diesel
Thanks

wore out · Jul 8, 2022

(quoted from post at 12:32:47 07/08/22) My tractor starts and runs good for 15 minutes then starts dying out and stalls--figured it was a fuel delivery problem so topped off tank, changed fuel filter, checked flow to filter, checked tank vent and still not fixed. it will run until it stalls,let sit for a few hours and will start up and run for a few minutes--is there a hidden fuel screen somewhere that may be plugged?
its a Shibaura 3 cyl diesel
Thanks

Can you tap into the supply line and check the fuel pressure being delivered to the injection pump?

I don't have a ''spec'' at hand but would GUESS 5 psi or so would be adequate.

If it drops to next to nothing as the engine begins to stall you will have to figure out what is restricting fuel flow through the filter and lift pump.

On the other hand, is there a chance someone grabbed the wrong jug and dumped some gasoline into the tank?

Vapor pressure from the gasoline ''contamination'' of the diesel fuel interferes with fuel flow and can cause EXACTLY what you are seeing when the engine and fuel pump heat up.

I personally know of two times that has happened.

One of the two I was personally involved with, and the diesel fuel still appeared ''normal'', but when the tank was drained and refilled with fresh #2 diesel the stalling disappeared.

If you are getting pressure to the IP and it still stalls gasoline in the fuel would be the next thing I'd suspect.

dpendzic · Jul 8, 2022

I am the only one who has ever put fuel in it so i dont think its gasoline contaminated--I drained the whole fuel tank and got new diesel to put in it--the fuel delivery is just gravity feed thru the filter and onto the injection pump===maybe i should check fuel flow thru the line to the injection pump??
Thanks

Harry in Ky · Jul 8, 2022

Yes. AT the injection pump. That's where it counts. Take the hose off, check the banjo bolt and fitting as well. Let the fuel run into jar or clean jug and see how long does the fuel flow in a full steady stream. It should run until the tank is empty, but if it makes it two minutes or so, then flow should not be your problem.

caterpillar guy · Jul 9, 2022

Start and run it till it stops then remove fuel cap immediately if you hear a suction then you found your problem the vent in the cap. Or just remove the cap and run if it doesn't stop you found your problem. I'd start there then look at filters for crude even though you changed them. Might take a look in the tank for something floating and sinking when it gets over the pipe for the engine draw. Also might look for a plugged return line take it off while running and see if you get any fuel out of it as you run it. No fuel will stop it also.

dpendzic · Jul 9, 2022

OK--thanks--ran it with the fuel cap off and still starves for fuel--i drained 8 gallons of fuel out of it and great flow the whole time--but checking the fuel return line is something i also need to do

91 FORD 1720 Fuel Problem

dpendzic

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wore out

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dpendzic

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Harry in Ky

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caterpillar guy

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dpendzic

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