Loosing prime

[BadAndy]

If i let the truck sit for two to three days i loose prime. i have to hand pump the fuel back into the lines to start without cranking the batteries to death. I looked at the lift pump from under the vehicle and did not see any weapage at all. Any ideas? Is there a way to find the leak? I assume air is leaking into the system and when it sits for an extended time the fuel drains back out of the lines.

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96 2500 extended cab full bed with a cap and running boards. 100% Amsoil with bypass oil filter. Everything else stock except bypassing the RWAL (rear wheel antiloc) operation so the truck will now stop when i hit the breaks without turning my hair white.

 

[DSiemens]

I had a leaking fuel return line that behaved like this. It was right behind the cab. The overflow valve on the pump will also cause loose of prime. I also had an injector line viberate loose on an injector but it never gave me any problems because I caught when it was getting damp by the line. Hope his helps.

 

[Timinator]

If you haven't replaced your fuel return line, now might be the time. Mine did this at first. No fuel weeping, but I did lose prime. Within a week I was leaking fuel.

 

[Missouri Mule]

Fuel return line, return fuel valve and
fuel drain valve on fuel filter check them all.
Fuel return line would be my first guess.

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Bill Thomas
Missouri Mule - 96 Wht 4X4 ST CC,5 spd, 3. 54, 8 ft bed, 1 ft high cheater boards.
99 Freightliner bl/wht FL60 ISB-5. 9 24v,215 hp,520 tq,6 spd, 3. 59 nsr,16 ft box, 19. 5 tires,Wt/gvw 11,000/23000

 

[The patriot]

How you doing BadAndy?
My truck was leaking too. I didnt have to prime it, but it seldom sat that long.
It was missing pretty badly for the first 1/2 mile or so.
Mine was the fuel return line like Tim mentioned. Took an hour or two, and a dollar to fix.
Eric