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I'm having a similar problem with my Thermoquad. If I keep the truck in service everyday no problems. But let it sit for a few days/week, and it will not start for a few minutes. Put a cup of gas down the carb, and starts right up. I'm thinking crap gas (Oxygenated to the max, plus additives). Perhaps a weak fuel pump has something to do with it too. I'm going to get a dual action mechanical fuel pump today. I think with the crappy gas now a days, and the old stock fuel pump (that's only a few months old) is just not up to snuff.

what's a dual action mechanical fuel pump?