1983 JD 8450 == Will not start - not getting fuel ==

Tom McKenna · Nov 26, 2012

1983 John Deere 8450. 5900 hrs. It will not start. Problem is fuel starvation -- will run a little on either. I cannot build any pressure on the hand priming pump, which tells me I"m not getting any diesel from the fuel tanks. I pulled the fuel line to the injector pump and no pressure or fuel when I hand prime or when I crank the engine. I will replace the glass filters, but I doubt this does any good, b/c I have never seen these clogged to the point where I get nothing thru them. There is also an in-line fuel strainer -- could it be clogged? I plan to replace this too. Parts books says there is a fuel check valve -- where it is I don"t know. Could this be stuck closed? Any other ideas out there before I start replacing parts?

Fuel tanks are full and this machine does not have the fuel / water separator device

cole in mo. · Nov 26, 2012

Remove the line from the tank and see what happens. If no fuel, might be somthing in the tank, remove the tank fill cap, and using a light amount of air blow from the line connection back into the tank.

showcrop · Nov 26, 2012

Sounds to me like you are sucking air somewhere. I would start checking connections, feeling for threads that have just a little too much resistance, etc. putting teflon tape on flares etc. one at a time and checking after each one to see if the primer will suck fuel.

Super Trucker · Nov 26, 2012

There is a small inline fuel filter up by the radiator that can get plugged. We found them when we switched to biodiesel in our fleet.

Huskers86 · Nov 26, 2012

I have a 8640 that the check valve is located on the filter housing. They are always going out. You may have to replace the primer pump. Where the hand pump is mounted, that's a fuel pump. You take the lines off and remove the two nuts and take it off. I had that go bad on me this summer. When you are hand priming you should hear the fuel returning to the tank if you have flow.

wijim · Nov 26, 2012

Are you located someplace cold? may be a little water settled in a low spot in the fuel line and froze. Or it could be jelled? A poor batch of number 2 diesel will jell at 33 deg. Just a thought. Jim

John B. · Nov 26, 2012

Yes I would start at the tank and use the process of elimination.
Just my thought.

FWB in SK · Nov 26, 2012

Had that happen to me. One of the steel fuel lines had a crack, I thought maybe from vibration.

Bill Krosnicki · Nov 27, 2012

I had a problem with fuel starvation on my 8630 once. I narrowed it down to not being able to pull any fuel from the tank. Must have been plugged with some dirt or something. I took an air nozzle and blew it backwards into the fuel line going into the tank and hooked it back up. That was two years ago, it's been fine ever since.

Tom McKenna · Nov 29, 2012

Thank you all for your advice. Got it started
yesterday. We blew air back wards from the pump
into the tanks. Once that cleared, we put the cap
back on the fuel tanks and did it again. This
created enough pressure in the tanks to push fuel
all the way thru the system back up to the
injector pump. Re-attached the fuel line, and
within a few pumps on the primer, we had pressure.
Attempted a start -- it ran for about 30 seconds.
Pumped the hand primer again, this time until we
heard fuel returning to the fuel tanks. After
this, it started and ran just fine. Thanks again
for all your help.

1983 JD 8450 == Will not start - not getting fuel ==

Tom McKenna

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cole in mo.

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showcrop

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Super Trucker

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Huskers86

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wijim

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John B.

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FWB in SK

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Bill Krosnicki

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Tom McKenna

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