I would post this in the diesel section but i am not a paying member yet. I have a 86 chevy blazer prior military. It has 6.2 with only 24k miles. I have a problem with hard starts. If i dont crank it in a couple days it is very hard to get started. Here is what i have done to test it. I have removed the line coming from the fuel lift pump and placed it in a 12 oz bottle. I cranked engine about 2 seconds and checked the bottle which now had about 1/3 full of fuel. I done this before and after the filter with same results. When the engine does start only the right side has any smoke come from it. But once running it is smooth and truck runns out fine with plenty of power, and no problem doing starts for the rest of the day. I have tested the ohms on the glow plugs and got a reading of .5 on most. I tested the voltage to the glow plug relay and got 12.89 volts. I have not changed the filter but have drained it to see if there could be problem with it. I have checked all lines as best i can. When i got it i drove it 900 miles to get it home with no problems, so i have new fuel in the tank. How do i test the fuel lift pump? or did i do it correctly but the pump was weak? I do bleed the air out using the air bleed on the side of the filter. Also what is the max speed i can go with the truck and not hurt motor? The dash has 55mph as max for Highway driving but i know that aint right.