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1990 7.3 fuel problem

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Old Nov 1, 2011 | 09:01 PM
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mikey11211's Avatar
mikey11211
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1990 7.3 fuel problem

hi all..i have a 1990 f350..7.3 non turbo..its losing its prime after sitting for about an hour. ive replaced the manual fuel pump and it was good for about 2 weeks..now i have to hit it with ether every morning to get it started. i just installed an electric fuel pump between the tank and the manual pump...no good. im guessing the problem is between the manual pump to the fuel filter? maybe a defective manual pump? when i bleed it i get alot or air out before fuel starts coming out...on the other hand when i cut the metal fuleline to instal the electric pump no fuel came out. now what ? any help would be greatly appreciated ..thanks
mike in nj
 
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Old Nov 1, 2011 | 09:35 PM
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hairyboxnoogle
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sounds like youre mechanical pump might have a bad diaphragm and letting air in, or you have a leak somewhere before the pump sucking air in.
 
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Old Nov 1, 2011 | 09:41 PM
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mikey11211
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thanks..should i replace the manual pump? sound like a faulty pump? is the diaphragm in the pump? i know nothing when it comes to that. thanks again
 
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