is it safe to put dry gas in diesel and run it through the engine? I think I had a water issue, truck ran like crap for a few days until I drained canister and put in new filter. I was told to run some dry gas to clean out any water left in the rails or lines. Thanks.
No, absolutely never put the stuff in a diesel engine. It will kill your injectors. It absorbs the water, and then when the water / methanol mix meets the injector tip, it flashes to steam. When it does, the steam eats up the injector tips.
Our engines have a water separator on them as part of the fuel filter. Let the separator do it's job and remove the water.