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I'm having trouble with my 1994 Ford F 350, 351 EFI gas engine, 2 fuel tanks. The engine will not start on it's own, I have to spray engine starting fluid in the air intake hose to start it. After it starts it will run fine, if I shut it off I have to go through the same procedure to restart it. We have run fuel pressure checks on both in tank fuel pumps, the rear pump was OK the front side tank pump showed low pressure. There has not been a check engine light coming on but we did a trouble code check anyway, no codes showed up. We just replaced the side tank pump but it has not cleared the problem. We have tried starting the engine using suggestions from the Haynes manual but nothing has worked. We also ran a test on the pressure regulator and it passed. The problem is the same no matter which tank we use when trying to start it. My brother thinks crud from the gas is clogging the injectors because it sits so long without being used. When I turn the key on the sound the engine makes is like an engine that is not trying to fire, it just spins until I release the key. I have swapped the fuse for the pump system but that did not work either. My friend who has the diagnostic tools lives in Tomball and I live in Channelview, he's been down here twice to help me, he's not a professional mechanic but he is pretty good at finding a solution. This has all of us stumped. Any help or suggestions will be appreciated. Thanks; Byron PS, I am retired and the truck doesn't get used much anymore, but I do still need it.