1993 Hunter 28 - When engine is running I notice a small drip around the fuel pump. The drip seems to be located near the manual pump lever that is used to bleed the fuel line. Is there a gasket or something that needs replacement? Is it a difficult job? Thanks
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M
Miles
Banjo fitting?
Did you tighten the banjo fittings where the hoses attach on either side of the fuel pump? They tend to work loose and leak. You might also have to replace the copper crush washers that get sqeezed between the banjo part and the pump, that did the trick on my Yanmar.
Did you tighten the banjo fittings where the hoses attach on either side of the fuel pump? They tend to work loose and leak. You might also have to replace the copper crush washers that get sqeezed between the banjo part and the pump, that did the trick on my Yanmar.
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Mark Roskin
May not be from fuel pump
You might want to dry off the drip and trace back (uphill) from the pump. I had a similar problem and it was a leak from the Yanmar filter bleed screw that traveled along the fuel line and finally dripped down from the pump.
You might want to dry off the drip and trace back (uphill) from the pump. I had a similar problem and it was a leak from the Yanmar filter bleed screw that traveled along the fuel line and finally dripped down from the pump.
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Bill O'Donovan
Both right
Start by wedging a cotton ball between the bleed screw and the edge of the fuel filter. If it turns red, that could be the leak. It could also be leaking at the fuel pump. My mechanic said Yanmar scrimps on lengths of fuel line, which tends to make them loose at the pump. A gentle tightening will stop the leak. I stress gentle because the pump is aluminum and the threads will strip easily. It's probably not dripping at the fuel pump gasket, even though that feels wet.They are very tight. Let us know your outcome.
Start by wedging a cotton ball between the bleed screw and the edge of the fuel filter. If it turns red, that could be the leak. It could also be leaking at the fuel pump. My mechanic said Yanmar scrimps on lengths of fuel line, which tends to make them loose at the pump. A gentle tightening will stop the leak. I stress gentle because the pump is aluminum and the threads will strip easily. It's probably not dripping at the fuel pump gasket, even though that feels wet.They are very tight. Let us know your outcome.
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Kevin
same as Mark
I had the same probelm as Mark. It appeared that I had a diesel leak at the low pressure fuel pump on my 2GM20. After some investigation over several weeks I found that actually is was coming from the banjo fitting on the primary fuel filter. The diesel was running down the solid fuel line to the low pressure pump then dripping off the engine. After I replaced the two copper gaskets the leak stopped. Kevin
I had the same probelm as Mark. It appeared that I had a diesel leak at the low pressure fuel pump on my 2GM20. After some investigation over several weeks I found that actually is was coming from the banjo fitting on the primary fuel filter. The diesel was running down the solid fuel line to the low pressure pump then dripping off the engine. After I replaced the two copper gaskets the leak stopped. Kevin
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Les Andersen
Banjo Band
Lewis, Couple of thoughts. The pump is made of some kind of zinc alloy. Not even as strong as aluminum. It really doesn't take much extra pressure to strip the threads out. Not fixable and you would have to replace the unit. Second, the copper washer is only good for a 1 time tightening. Don't even try to "just tighten it up". It won't stop a leak and that's when its easiest to strip out. Third, there are two different size (thickness) washers on either side of the pump. Make sure you replace the washers correctly. Fourth, when you replace the washers and tighten them you are supposed to keep the fitting from sliding around as you tighten. If it slides it won't be a good seal. On metal mesh covered hoses like the one on the pump, if you pull the hose away from the direction of your tightening turn, ie counter clockwise, hold it and then tighten; you will put a clockwise pressure on the fitting and help keep it tight. If you don't, engine vibration will work with the hose to cause it to loosen. Last, get several sets of spare washers as this is an exercise you will perform many times. Good luck, Les s/v Mutual Fun
Lewis, Couple of thoughts. The pump is made of some kind of zinc alloy. Not even as strong as aluminum. It really doesn't take much extra pressure to strip the threads out. Not fixable and you would have to replace the unit. Second, the copper washer is only good for a 1 time tightening. Don't even try to "just tighten it up". It won't stop a leak and that's when its easiest to strip out. Third, there are two different size (thickness) washers on either side of the pump. Make sure you replace the washers correctly. Fourth, when you replace the washers and tighten them you are supposed to keep the fitting from sliding around as you tighten. If it slides it won't be a good seal. On metal mesh covered hoses like the one on the pump, if you pull the hose away from the direction of your tightening turn, ie counter clockwise, hold it and then tighten; you will put a clockwise pressure on the fitting and help keep it tight. If you don't, engine vibration will work with the hose to cause it to loosen. Last, get several sets of spare washers as this is an exercise you will perform many times. Good luck, Les s/v Mutual Fun
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Mike Daus
Same problem
Last year, our Yanmar 3GM had a similar drip that I traced to the banjo fitting on the inlet to the primary filter. I tightened it but now appear to have a slight drip on the other end of the shielded hose at the pump outlet. There is very limited room on the stbd side of the engine compartment to get a wrench on the pump-side fitting. Probably just as well because, as with other maintenance efforts, I would likely overtighten and strip the threads. Thanks to the previous posters identifying the soft material used for the pump body. Once I find the proper wrench and figure out how to get to it, I will take care not to overtighten. Mike s/v Charisma 82 H36
Last year, our Yanmar 3GM had a similar drip that I traced to the banjo fitting on the inlet to the primary filter. I tightened it but now appear to have a slight drip on the other end of the shielded hose at the pump outlet. There is very limited room on the stbd side of the engine compartment to get a wrench on the pump-side fitting. Probably just as well because, as with other maintenance efforts, I would likely overtighten and strip the threads. Thanks to the previous posters identifying the soft material used for the pump body. Once I find the proper wrench and figure out how to get to it, I will take care not to overtighten. Mike s/v Charisma 82 H36
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