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kev13
United Kingdom
114 Posts |
 Posted - 27 Aug 2017 : 15:44:47
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Anyone any idea please why my Yanmar keeps sucking air in the system and therefore fails to run. I keep manually having pump fuel up and bleed the air out the system, which then runs for a few hours before it does it all over again
KDavey |
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stratford4528
United Kingdom
414 Posts |
Posted - 29 Aug 2017 : 08:08:32
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| Which Yanmar engine is it. |
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cliveshep
Thailand
1324 Posts |
Posted - 29 Aug 2017 : 10:31:15
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Try the logic route - if it sucks air on the suction side of the pump inspect all joints, banjo's and hoses. Especially look at fibre washers on unions. Look at the rubber rings on fuel filters and water traps, look at the tank pick-up.
Sometimes the most stupid thing is the cause, like a copper or fibre washer kinked on a bleed screw, or a hose chafed, or similar things.
I wish you well but really it is often a tedious hunt for something that sucks and not blows, if it blew finding it would be a doddle - it would be wet with diesel.
Ideally change all rings and seals, check all unions not only for tightness but for any damage to the pipes, and fit new flexible pipes. Check the lift pump, is that leaking? Fit a pump kit to be certain, it's a good preventative service move anyway.
Then if nothing has changed you know where to look next - the injector pump is the only thing left!
Finally living the dream!
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df
United Kingdom
5994 Posts |
Posted - 03 Sep 2017 : 17:56:40
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If you have cav type pre-filters they often end up with two seals in the groove when the old didn't come out at filter change, it's not always easy to see if the filter is in a tight spot and it causes the second seal to distort leaving an air leak, it's best to put a sharp pick into the groove to make sure it's empty.
The cav type filters are often used as pre-filters for other makers setups.
NBAS--The communal colostomy bag of the boating community.
 Visit leomagill.co.uk |
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Dispel Yanmar keeps sucking air
