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Dash primer will not hold pressure since it will bleed off for starting while glow plug is energized.

Ditto on the #0000 steel wool, carb spray and air blow good.

Make sure that your manual fuel shut off is opened all the way too.

On one of the trucks I have now, it has a Schrader valve on top of the fuel filter instead of a petcock valve. It works well to bleed the air out when you pressure the fuel tank with about 5# of air pressure after a filter change out. You can also pressure up the fuel tank to find suspect air...

On the M818, you can loosen the brass head on the selector valve after the handle is removed and then unscrew it the rest of the way after you drop it down. Not sure if the M931 valve is identical or not. I took the valve all the way out because my hoses were all in bad shape and I wanted to...

Just got through replacing the O-rings on the selector valve on the M818 as well as replacing the badly cracked hoses on the selector valve. The selector valve was by-passed before and only drawing from the left tank. I used the Parker brand "push-lock" 1/2" and 3/8" hose on the fittings and...