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 Post subject: 8340 loosing fuel prime
PostPosted: Wed May 25, 2016 10:16 pm 
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When our 8340 stands around for a couple or three days when the fuel tank is low it looses its prime and wont start and the only way to bleed it is with a full fuel tank. Do the panel know of any obvious areas where the leak might be? It's not leaving puddles on the floor and I wondered if the diaphragm in the lift pump was split.

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PostPosted: Wed May 25, 2016 10:59 pm 
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The Pretender wrote:
When our 8340 stands around for a couple or three days when the fuel tank is low it looses its prime and wont start and the only way to bleed it is with a full fuel tank. Do the panel know of any obvious areas where the leak might be? It's not leaving puddles on the floor and I wondered if the diaphragm in the lift pump was split.


I'd start with the hand primer- if its letting air in on a part tank it could be letting fuel back to the tank and also be why its not priming until you top the tank right up reducing the pump's head. Also check for any rubbed nylon hoses and if there are any of those rubber/poly connector tubes that connect things together- look for hairline cracks in them.

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PostPosted: Thu May 26, 2016 2:45 pm 
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footsfitter wrote:
The Pretender wrote:
When our 8340 stands around for a couple or three days when the fuel tank is low it looses its prime and wont start and the only way to bleed it is with a full fuel tank. Do the panel know of any obvious areas where the leak might be? It's not leaving puddles on the floor and I wondered if the diaphragm in the lift pump was split.


I'd start with the hand primer- if its letting air in on a part tank it could be letting fuel back to the tank and also be why its not priming until you top the tank right up reducing the pump's head. Also check for any rubbed nylon hoses and if there are any of those rubber/poly connector tubes that connect things together- look for hairline cracks in them.


Rubber fuel hoses and fittings not uncommonly get just slightly porous with age. No significant fuel leaks, but they let air in, and if the primer pump then dries out, won't seal properly and therefore doesn't lift properly. Might be the pump diaphragm, but they are well known tricky things, and are therefore made of an unusually high quality rubber, and rarely fail.


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PostPosted: Thu May 26, 2016 6:08 pm 
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The other thing would be the pick up pipe in the tank, which could have a hole in the side, when the level falls below that it will loose prime


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PostPosted: Thu Jun 02, 2016 8:56 pm 
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Ours had a chafe on the pipe that comes up from the tank and crosses the transmission under the front end of the cab. I cut and shut with some rubber fuel pipe. The other thing could manual lift pump be leaking in some air. A friends one had developed a crack the housing.


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PostPosted: Fri Jun 03, 2016 8:04 am 
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Have you tried turning it off and turning it back on again.................. :roll:

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