And / or you could have a leak in a hose or o-ring that allows air in and so 
the fuel flows back to the tank.
-- 
Max Dillon
Charleston SC

On April 16, 2019 5:12:11 PM EDT, Curley McLain via Mercedes 
<mercedes@okiebenz.com> wrote:
>the "double head banjo bolt" that holds the overflow/return hose to the
>
>back of the IP is a check valve.  They are not expensive to buy a new 
>one.  There are also valves in the transfer pump.
>
>Dan Penoff via Mercedes wrote on 4/16/19 3:59 PM:
>> Oldest son had a weird occurrence the other day. He came home with
>the fuel just on “reserve” - the light had just turned on a few miles
>from home. He parked the car in the driveway, which is tilted down
>maybe 10 degrees, with the rear of the car on the low end, nose
>pointing up.
>>
>> The car sat for maybe a day and a half before he went to drive it
>again. It wouldn’t start, but cranked mightily.
>>
>> He loosened the spin on fuel filter to find that it was about half
>full.  He rolled the car out into the street where it would be level,
>filled the filter with diesel, and put the car on the charger as the
>battery was tired from cranking.
>>
>> An hour to two later he came out, cranked, and it started right up.
>He immediately went to the gas station and filled up, no problem since.
>>
>> We’re wondering if there is a check valve in the filter head or at
>the injection pump that prevents fuel from leaking down that might be
>bad?
>>
>> -D
>>
>
>
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