Ok so Im looking @ a 78 power wagon with a 12 valve out of a 90 that has had i/c ran to it off of another rig first off.Iirc people say to stay away from the 89-90.5?Or so is that correct?This is what he says about it I copied & pasted it.
It has a intercooler on it now from a 91 it is a non I/c motor meaning it has the 9mm injector nozzles instead of the 7mm nozzles that the 90.5-93 have.
Then he said.... No it does have the grid heater I think the mechanical lift pump my be getting weak it will fire and run for a few seconds then dies and that's it lol
Then.... I know when it's fourty or above it lights right off as soon as you breath on the key but if it idles a lil bit it will fuel haze....&then.... Yah the grid heater cycles on you can see the volt gauge dip and I didn't wait for it to heat up wanted to show how easy it starts up at this temp even with out the grid heater heating up......
Then..... If is a rotary pump and the lift pump is a mechanical one on the side of the block looks like s small block Chevy one I know in the winter it. Will fire right up like it did in the video after the grid heater cycles of course and will run for some times 5 some times 10-15 seconds then slowly losses rpm until it dies and won't restart have had several people tell me that that is the lift pump cause when the rubber diaphragm gets cold it won't pump if the pump is going bad .
Now I know little about 12 valves & still fairly new to cummins I have a 24 valve.I askes over on another forum but Im looking@buying it soon if this doesn't sound like it's going to be trouble to you guys that know these things?So I figured Id reach out as much as possible.Any ideas would be great thank you.

 

It sounds to me like it could be as simple as a rubber fuel hose connection between the tank and lift pump that sucks air when it gets cold. That's where I'd start looking anyway.

 

Sounds like it should be a easy problem to fix, first thing would be a new fuel filter then checking all fuel lines for possible cracks and lift pump performance.

 

So this is nothing that would scare you guys away?

 

I don't think that part would specifically. My two biggest concerns would be how well the Cummins conversion was done, and the condition of the base engine itself. Definitely though, if you can't even get it running long enough for a test drive, I would be worried about all the big unknowns there, like whether the transmission has all its gears, or if the engine loses oil pressure and knocks when it gets up to temperature, etc.

 

I can take it for a test drive the gentleman just says that Bruno 30 it just dies. Besides that

 

Could be water in the fuel, and fuel filter is gelling up and killing the motor once it starts running in the colder weather.

Some fuel additive...powerservice 911 in the red container in the tank, and a new fuel filter and lift pump, and I bet you should be good to go. Checking the lines is always a good thing as well.

Hazing could be from worn out, leaking injectors. My 89 motor used to haze badly at idle and down the road, but once I swapped in a new set of 9mm injectors everything cleared up.

BTW the Non-IC with 9mm sticker were from 89/90 and early 91. The IC motor with 7mm sticks came in late 91.5 to 93. The later 2nd Gen 12V use 7mm injectors as well, but they are not interchangeable with the earlier motors due to tip size and spray patterns....IIRC.

 

thanks he said he put or the guy who did the swap put an intercooler on there and it now has 9 mM injectors