M923A2 wont start......

[Fireaxe]

I have a 1991 M923A2 8.3 Cummins, just drove it back from Iowa, to Littleton Colorado. It says it only has 8500 miles and 310 hours. Going to make a Fire truck for the hills. The Alternator went out on the road and Wings truck stop just happened to have a used one. Buck fifty later back on the road! The mechanic said the fuel shutoff solenoid was going out so he wired it open and I just had to un hook it to shut it off. Well I made it home in 2 days, little sore, but then, the next day, no power to the gauges or any solenoid's or ignition. I replaced the Control Box and now have power to the dash and it will turn over fine but will not bust off? the fuel shutoff solenoid still wont work (I thought it might be in the control box). Does anyone have any Ideas on what to do?? Thanks....

 

[Suprman]

If the fuel solenoid is not retracting then you won't get any fuel. If the solenoid is bad you should replace it. You could have lost prime did you crack open the feed screw on the injector pump and see fuel? If not you will have to prime it there is a hand pump on the drivers side of the engine just follow the fuel line.

 

[Fireaxe]

I don't see a hand pump, is it on the block or fuel line? not sure what the feed screw is, do I need to be cranking it to see fuel?

 

[Triple C]

Have you downloaded the tech manuals, they should show you what you are looking for. The fuel pump is driver side about six inches behind injector pump, has a T handle that you use to prime if you lose it.

 

[Suprman]

A2 trucks have a push button you may have to pump it 50 times. There is an 8mm screw on the inner side of the injector pump you have to unscrew it 2-3 turns no farther or it will fall out and get lost. Pump the primer till you see fuel then tighten the fuel screw and try to start it

 

[Fireaxe]

I found the push button, I am going to get fuel to fill the filter, then I will try it, Thanks so much. Do you know where I can get the tech manuals? I downloaded a 450 page manual but it just tells how to operate stuff and to contact maintenance for any issues.... well I guess out of the military, I'm maintenance.....

 

[juanprado]

Latest and greatest "23" posted in the middle of the page dated Sept 2012. They have the better flow charts and troubleshooting than the old "24"

http://www.jatonkam35s.com/jatonkaM939seriesTMdownloadpage.htm

 

[sandcobra164]

Tilt the hood, go to the driver's side of the truck. You'll see the shut off solenoid mounted on the side of the injection pump. Push the plunger back with your fingers and rotate the throttle linkage clockwise. Release the plunger, attempt to start the truck. It'll probably crank up now. We've had terrible luck with that shut off solenoid and the instructions I just gave are from the mad Sandcobra who has said those word's many times over to operators when we still had the A2 M939 trucks in service. If you don't have a new solenoid, that's fine, it will still shut off when you turn the switch but it won't crank back up until you do as I said.

 

[Fireaxe]

Thank you guys so much! that worked great started right up! My fuel shutoff solenoid even works now. I am going to look for a new solenoid and replace this one cause it didn't seem to work all the time. Thanks again wish I could buy you a beer or something, you saved me a lot of money!! Steel Soldiers is the best!!!