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Issues with my New Truck.

Warthog

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I changed the title of this thread to be all inclusive for the OP's truck issues.

Post away for his questions.
 
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doghead

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I merged two threads, because they are almost certainly related.

No need to 939 series posts here though.
 

Westech

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You might need to change the lift pump. If I remember correctly it has a small valve to hold full pressure so its not so hard to start.
My dad has an 83 GMC that has a 350 SBC and a edelbroc carb he said that if you pump the throttle a couple times it makes it spray fuel down its throat for easier starts. The only reason this works is because of that little valve in the lift pump and from what I've read the pumps are the same. Its possible I'm wrong so don't shoot me if I am.

Yeah 100% wrong.
There is no valve in the pump like that.
What you are describing is a accelerator pump that is inside of the carburetor.
A diesel engine does not have a carburetor or an accelerator pump.
 

Skinny

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A diesel will start with fluid assist IF you have disabled the GP's or heating grid. A diesel should not be started with fluid if they are not working because you may get a single GP that glows and puts a hole in the block.

Fuel system stays primed with check valves which exist typically in the filter, pump, or IP.
 
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A diesel will start with fluid assist IF you have disabled the GP's or heating grid. A diesel should not be started with fluid if they are not working because you may get a single GP that glows and puts a hole in the block.

Fuel system stays primed with check valves which exist typically in the filter, pump, or IP.
Ok so... My plan of attack should be:
1. Make sure GPs are working.
2. Replace fuel filter with the "spinner mod"
3. ???
4.???
 

Skinny

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If your truck lacks in the maintenance department or you/previous owner have not tackled it yet I personally would:

-replace all GP's with AC Delco 60's
-bypass resistor and remove
-confirm system cycles correctly according to temperature
-replace all rubber fuel lines
-install a spin on unless your box filter is in absolute perfect condition
-replace lift pump (OEM AC Delco can be had for around $30 on RockAuto, just cheap insurance)

You should be good to go as long as your IP is in decent shape and your starting/charging system functions correctly.
 

number9er

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-replace all rubber fuel lines
-replace lift pump (OEM AC Delco can be had for around $30 on RockAuto, just cheap insurance)
My money is on one of those. If you're losing prime or getting air bubbles in your fuel lines, it's going to be tough to start. But lay off the starter fluid either way. You're flirtin' with disaster. There's usually a sticker on your air filter cover that tells you as much.
 

86m1028

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If your truck lacks in the maintenance department or you/previous owner have not tackled it yet I personally would:

-replace all GP's with AC Delco 60's
-bypass resistor and remove
-confirm system cycles correctly according to temperature
-replace all rubber fuel lines
-install a spin on unless your box filter is in absolute perfect condition
-replace lift pump (OEM AC Delco can be had for around $30 on RockAuto, just cheap insurance)

You should be good to go as long as your IP is in decent shape and your starting/charging system functions correctly.

Thats a LOT of good advise right there.
 

Warthog

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Let's start with the basics. Are you aware that this site provides free copies of all the technical manuals for your truck?

They are located at the top of the page. Click on Technical Manuals

There is a parts manual that lists all the items used on your truck with diagrams and GM part numbers.

Look up the part number for the GM diesel fuel(lift) pump and use it to find a new one/
 

brasco

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Just for the record, my comments were only made to relate the hard starting issues of this vehicle to my own experience with a M931A2 thinking fuel prime might be something to investigate. I clearly stated that TMs for the M1009 should be consulted. Sorry if my comments in this thread were construed as being a discussion about M939 trucks; that was not the intent.
 
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478
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18
Location
Tucson AZ
Let's start with the basics. Are you aware that this site provides free copies of all the technical manuals for your truck?

They are located at the top of the page. Click on Technical Manuals

There is a parts manual that lists all the items used on your truck with diagrams and GM part numbers.

Look up the part number for the GM diesel fuel(lift) pump and use it to find a new one/
Yes sir I looked at the manuals but didn't get that deep yet. I will continue to learn those as fast as I can.
 
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