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Topic: fuel pump problem
hank in advance for your contribution. i have DAF trucks lf55 that encounter engine dead while idling after the engine death than i cannot run the engine (cannot fire but able to crank ). Base on the DAVIE diagnosis the pressure in the rail is below system requirement basically the rail pressure is "zero". i changed the high pressure fuel pump Bosch 0445020007 to solve this issue .The new fuel pump i just replaced can only run on the truck for 10 day ;today the truck was down again and the symptoms is like earlier engine death while idling.

As usual i though it was fuel pump malfuction problem AGAIN ,and i replace with the fuel pump.Pressure remain Zero in rail though we have change the new fuel pump.

when my mechanic trouble shoot it, he found out the pressure from the feed pump of the 0445020007 BOSCH fuel pump is very low (basically feed pump and high pressure chamber is in one body).
i suspect feed pump HAVE FAILED to supply enough diesel volume to high pressure chamber to further compress .and i suspected this is due to the "leak" in the fuel line before entering the feed pump (gear chamber) .That is why my fuel pump damage because of no fuel have gone into the high pressure piston chamber and causes the pump run dry.

Have anyone here have the same issue of malfunction fuel pump ? can give me comment what is the possible cause of this problem .

by lok Mon May 05 16:23:20 UTC 2014
 
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