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Ok my work truck has fresh gas but has been sitting for a month. It is a 2003 F250 ran great, parked for a month....cranks over great but wont fire. Need help cant afford to take to the shop. Any ideas?
My 5.4 did something similar the first few days after I bought it. If it didn't start on the first attempt (or died shortly after starting), subsequent tries would be futile. I even had it in a shop once (for an unrelated reason) and the guys thought it was out of gas because they couldn't get the engine to fire. From what I can tell the problem seems to have been casued by sitting on the dealers lot for for many weeks before I bought it, since it appears to have gone away now that I regularly run it once or twice a week.
When I was having the problem, I found that the best solution was to let the engine sit for a minute or two after cranking, then pump the accelerator several times, then hold it down about 1/2 way and crank it again. It always fired right up for me that way.