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How do you keep your truck runnig when it gets 80 plus degrees

(2008 Chevrolet Silverado 2500 HD)
in Manhattan, IL on May 30, 2012
pulling 14' enclosed trailer 3500lbs total wt. bucking wind 1/4 tank of fuel ding ding reduced engine power comes on drops to 35 mph tells me to change fuel filter [not the problem] sometimes if you pump up the primer on top of filter it will take off again i think the code is fuel rail pressure it only does this when it gets hot out no one seems to know the problem if i stop and fill tank that helps check engine stays on for a while and then goes off and if the weather cools off no problems this is driving me nuts truck has 167000 miles on it this is costing a fortune in filters also when it gets 10 degrees or lower it does the same thing
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