wont crank when hot?
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New User
Joined: Jul 2003
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wont crank when hot?
ok i bought an 89 f350 7.3l diesel about 3 weeks ago for a work truck for my job. it runs like a top once it is started..... which brings me 2 my question. the engine starts right up when it is cool. but if you drive it long enough to get it hot then kill it. good luck on the startup. sometimes it takes 5 seconds ...sometimes 30 seconds and today not at all. i left it alone for about 5 hours and it cooled down and fired right off. when i got the truck i put a new fuel filter on it. new glowplugs. glow plug swith and relay. didnt help a thing. any advice would be great thanks
Elder User
Joined: Mar 2002
Posts: 529
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From: France
wont crank when hot?
Sounds like maybe your fuel is draining back somewhere, check the shrader valve ( looks like a bicycle tire valve) on the fuel filter housing, do this in the circumstances where the truck refuses to fire, and see if fuel skirts out normally. Try starting it without the air filter also.Check all the electrical connections to the injection pump, one might be loosen up when the engine is hot.That's all I can think of for the moment, these engines are usually hard to start when cold not hot !!!
Magic
Magic
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New User
Joined: Jul 2003
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wont crank when hot?
my problem is the engine will just keep turning over but never start when it is hot....after say running for thirty minutes or so. if i kill the engine then get back in it takes forever to start and sometimes it wont unless i let the engine cool all the way down.
thanks ahead of time
thanks ahead of time
Posting Guru
Joined: Sep 2002
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From: Northeastern Pa - USA
wont crank when hot?
Either the fuel is draining back and has be primed before it will fire up or there is a bad connection on the electrical supply to the injection pump. Do as magic stated above and see what your results are. You can also look at the fuel lift pump ( looks like a fuel pump on a gas engine) and see if the fuel is leaking from there too. Also the lift pump may be getting weak on you. But check the fuel supply by pressing on the schrader valve first. It should shoot fuel across the engine when cranking the engine over. DONT GET TANGLED UP WITH MOVING PARTS. !!
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Lead Driver
Joined: Jan 2005
Posts: 7,782
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From: Huntington Indiana
Sorry to say but "diesels" don't have distributers - injection pump does the same work only with fuel - no electrical involved.
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More Turbo
Joined: May 2008
Posts: 548
Likes: 3
From: Beaufort, SC
I'm having the same problem with my 93 7.3 NA. It has 250,000 miles on the IP and it suffers from the "Heat soak" problem. I was told that I can pour lukewarm water on the IP's hydraulic head (where the injector lines come out of it) and cool it down. That brings the internals back into proper tolerances and allows the IP to pump fuel properly.
The BIG catch is, that you run a risk of shrinking it too much and snapping the input shaft. That will make the pump's core value a big fat ZERO!
It's better to just replace the IP and be done with it..
Gary
The BIG catch is, that you run a risk of shrinking it too much and snapping the input shaft. That will make the pump's core value a big fat ZERO!
It's better to just replace the IP and be done with it..
Gary
Laughing Gas
Joined: Mar 2006
Posts: 1,083
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From: Fitzpatrick Alabama
DO NOT POUR WATER ON hot PUMP!!!!!!!!!!!! It will ruin pump. If that is the problem you need a pump anyway. If it was a leakdown it would happen after 3 hours and after overnight as well regardless of hot or cold.