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Fuel system problem

Baron69

New member
5
1
3
Location
NY
I just recently purchased a duece. It ran when they parked it and will run with a little sniff of starting fluid. When it turns over the fuel seems to be returning to the tank before it gets to the injectors. Any ideas I am new to these
 

Floridianson

Well-known member
Steel Soldiers Supporter
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Interlachen Fl.
With just the in tank fuel pump running ( motor not running ) the fuel is always returning to the tank after it goes through the injection pump. With motor running same thing it is a circulatory system. So she will fire up on starting fluid but not stay running. You could try and look over the trouble shooting manual but as long as we have fuel flowing through the head / IP they should start and at least idle. Most problems we see here are problems with something wrong in the Head unit not the whole injection pump. You could start with the easy check of the fuel control unit assembly that is under the shut down cover. If the truck has been shut down and left correctly with the shut down cable pulled out and the fuel control unit assembly is getting sticky or stuck it will not run / start.
 
Last edited:

Baron69

New member
5
1
3
Location
NY
With just the in tank fuel pump running ( motor not running ) the fuel is always returning to the tank after it goes through the injection pump. With motor running same thing it is a circulatory system. So she will fire up on starting fluid but not stay running. You could try and look over the trouble shooting manual but as long as we have fuel flowing through the head / IP they should start and at least idle. Most problems we see here are problems with something wrong in the Head unit not the whole injection pump. You could start with the easy check of the fuel control unit assembly that is under the shut down cover. If the truck has been shut down and left correctly with the shut down cable pulled out and the fuel control unit assembly is getting sticky or stuck it will not run / start.
Thanks for the reply. I will check that when it warms up a little it's -3 this morning. The previous owner said last time he ran it it would only idle. Could it possibly be stuck part way
 

cattlerepairman

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NORTH (Canada)

Do any of these describe what you are experiencing?
 

Floridianson

Well-known member
Steel Soldiers Supporter
7,409
2,503
113
Location
Interlachen Fl.
Guess if the fuel control unit assembly is moving free and springing back from the seven oclock position to about the four oclock then next step. Guess smart thing would be to check delivery valve by removing it and cleaning out the port of any crud that might be stopping it from closing. Then If delivery is ok then guess you are looking at the Head removal and checking for dropped button, broken plunger spring or broken plunger guide.
 
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