I "thought" my truck was not running quite the same last weekend, so out come the test gauge, screwed it on the injector pump and zero pressure. Pulled the relay and put a little grease on the terminals. Reach down and tighten the connection to the gauge. Drive the truck a little bit and pressure is going down. Second day, put the gauge on and drive to first store pressures fine. Come out to go to second store, and no pressure. At the third store, take pliers and turn the gauge connection another 1/4 turn and pressure jumps and stays up. Drive around, down to the boat and check the boat. Back in and home 15 lbs at idle, 11-13 cruising, and 7. 5 at WOT. SO TIGHTEN the SCHRADER connection tigher than finger tight when testing. Seems finger tight on mine is not enough to push in the Schrader valve.
SNOKING