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derby, If the lift pump is not supplying the fuel system, the booster pump does you no good. You are correct about the flame heater filter. I would also check that for free flow. I'll bet not too many guys change that because of the place it's in. If you have a new one on hand, change it. Mine...

I have a flame heater setup on my truck and it did not start well in the cold till I changed out my in-tank pump. You could hear the pump run but it was not pushing any fuel. You definately have to check for fuel pressure and as was mentioned check or change fuel filters. If the fuel pump is not...

With all of these add-ons , it should start up with no problems. You may have to look some where else for the problem. Make sure your batterys are up to par, that means both of them. If you have one weak battery or two, the engine will not spin fast enough to fire. It wont matter how well...