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ian_eagland
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Fuel Filter on Yanmar In-board
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My very reliable in-board let me down today with an air bubble in the fuel. The problem can be traced back to the spring when I replaced the fuel filter and did not quite secure the seal to the underside of the glass bowl. Sea Start, who came to my rescue in minutes, told me that the glass bowls can be replaced with an alumium one piece body to save trying to keep the system air tight. Anyone else had experience of this?
Richard,
I'm suprised no-one else has answered this as it can be an emotive subject. Firstly, CAV filters are available with an aluminium lower section, but the newer ones have a one piece clear plastic lower section and if you wish to change it, this is probably the one to go for.
CAV filters are notorious for being difficult to replace properly and I remove the filter from its mounting and assemble it upside down as you can then see what you are doing regarding the seals. You do need sufficient slack in the fuel hose to do this, though. One other advantage of using this method is you can use the drain screw to bleed the filter (when it is upside down) which is always another problem with these. Make sure the centre bolt is firm but not too tight as this can also distort the seals.
Having said all this, I would take exception at the diagnosis - as the filter is mounted below the tank on a shrimper, diesel SHOULD leak out rather than air leak in. It is possible to get air in but the tank level would need to be very low or perhaps the filter was partially blocked.
One other possibility you might consider is changing to a different type of filter, such as RACOR. However, these are very expensive.
Best regards,
Graham
I'm suprised no-one else has answered this as it can be an emotive subject. Firstly, CAV filters are available with an aluminium lower section, but the newer ones have a one piece clear plastic lower section and if you wish to change it, this is probably the one to go for.
CAV filters are notorious for being difficult to replace properly and I remove the filter from its mounting and assemble it upside down as you can then see what you are doing regarding the seals. You do need sufficient slack in the fuel hose to do this, though. One other advantage of using this method is you can use the drain screw to bleed the filter (when it is upside down) which is always another problem with these. Make sure the centre bolt is firm but not too tight as this can also distort the seals.
Having said all this, I would take exception at the diagnosis - as the filter is mounted below the tank on a shrimper, diesel SHOULD leak out rather than air leak in. It is possible to get air in but the tank level would need to be very low or perhaps the filter was partially blocked.
One other possibility you might consider is changing to a different type of filter, such as RACOR. However, these are very expensive.
Best regards,
Graham
Thank you, Graham. Have been on the boat this morning and have realised what went wrong! I replaced with another make of filter and the seal between the glass bowl and the underside was slightly too large. I have now replaced with a Delphi filter - the £2 saving was not worth it! - and all went back very easily. Just taken the boat for a half-hour blast round the harbour and all seems fine.
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