Bleedin' Diesels

[snowleopard]

Re: Bleedin\' Diesels

i thing the arrangement you suggest (tank between lift pump and final filter) could cause problems. the system is designed to have the lift pump feeding the injector pump. if you put a tank in between this arrangement is disturbed and the injector pump would rely on gravity and its own suction. if the tank were sealed it would provide the pressure but would also collect any air and need to be bled occasionally.

if you took the output from the lift pump to the primary filter then back to the final filter you would be able to bleed the whole system using the lift pump.

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[johna]

Re: Bleedin\' Diesels

Amazing what you find in past issues of PBO. I am researching Brittany ready for a May cruise and I find in Issue 409, January 2001, page 108, a description of a day tank installation aimed mainly at protection against dirty diesel.

The concern shown in the article was more that the primary fuel pump had sufficient head to raise it to the day tank rather than the loss of head to the injector pump. It states that most fuel pumps have a lift of about 1 metre; this would be from the lowest fuel level to the inlet into the day tank plus friction in the pipework.

Advantages are quoted as being no priming required as bleeding is by gravity, some protection against fuel pump failure, circulation and recirculation of fuel through the water separator/filter, ability to quickly replace contaminated fuel and the day tank is an ideal source for diesel heaters etc.

Perhaps I should fit one.

Johna




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