From: James Shanks (n1vbn@bit-net.com)
Date: Tue Jan 20 2004 - 12:34:53 PST
It sounds to me like you have a pinhole in your supply fuel line somewhere.
That is between the fuel pump and the fuel tank. Think about it ...if the
mechanic has to lightly pressurize the fuel tank to get fuel going there is
a leak between the fuel tank and the fuel pump. Check carefully any rubber
fuel lines from the tank to the pump for cracks, pinholes. Also check the
metal fuel lines as well.....remember how old she is. If it was me I think
I'd replace all the fuel lines from where they exit the fuel tank to the
pump. The line from the pump to the carb is pressurized so a leak will
quickly become self evident. Think logically ???? The pump SUCKS fuel from
the fuel tank and PUSHES it to the carburetor. Hence the smallest pinhole
not visible to the naked (???) eye will allow fuel to drain back to the
tank. HINT start replacing the rubber fuel lines from the pump to the tank
whether they need it or not. There are teeny tiny balls in the intake and
output of the fuel pump that act as check valves so presuming they are ok.
If the fuel drains all the way back into the fuel tank an in line electric
pump won't work if there isn't any fuel in it to move, it would have to be
installed like a modern vehicle with a in the tank fuel pump sending unit.
Jim
At 03:11 PM 1/20/2004, kuhrick wrote:
>my m886
>i have had 3 fuil pumps on it and 3 carbetaters on it
>float boll was leaking
>last cab fixed it
>i was carrying either to start it if it didn't take off
>i still think about a elt fuel pump close to the tank
>rubber fuil line thru frame infrunt of right back tire
>i was thinking bout a push btten or a iol lite switch in the fuel line
>by the carb
>less than 2-3 lbs starts thje elec pump
>ken m886
>
>
>
>
>At 02:05 PM 1/19/2004, Mel Miller wrote:
>>Howdy List,
>>
>>I hope someone can help with my fuel system problem. I have a stock
>>military 318 engine in my 1977 M884 pickup. I recently replaced the
>>Carter carburetor with the military Holley carburetor. The fuel pump is
>>relatively new and flow rate and pressure exceed specifications. Ignition
>>and timing are set properly and firing properly. The plugs are clean and
>>a uniform gray. When I run it every day or every other day everything is
>>OK. If I let it sit for a week or so and then crank it it will run for a
>>few seconds and then die. no amount of cranking will get it going.
>>
>>Careful inspection reveals a dry float bowl, dry inline fuel filter dry
>>fuel pump and dry line back to the tank. I have never seen a situation
>>where fuel siphons back into a tank from a float bowl. This has happened
>>twice now. A mechanic who specialises in Dodges says that he had to
>>pressurize the tank to get the fuel back to the fuel pump.
>>
>>All ideas gratefully explored.
>>
>>TIA,
>>
>>Mel Miller
>>Corpus Christi, TX
>>361-937-3317
>>M725
>>M884
>>86 VW Doppelkabin Drop Side Diesel PU (OD)
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