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M49 Carb leak

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After finishing up my 1970 M49, when I turned on the gas, I get a leak  from the top of the banjo fuel filter (white  area). In the parts book looks like there is no gasket between that and the float bowl , just the filter. I already replace the the o-rings and bowl gasket so I'm guessing I need a new filter/and or a float needle? It still has the original plastic needle in it. One last thing, would a NGK B6ES (.021 gap) plug be the right one to use? Thanks

banjo.jpg

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The top ring of the filter is normally the only thing used to seal the top side of that banjo joint. There may be a minute defect in the filter ring or either of the metal surfaces. There is no law against using a bit of sealant there.

Other possibilities include a tiny hole or crack in the bowl or the banjo bolt thread bottoming out.

A protruding tip plug is better for that motor. I use BP5ES and BP6ES. Yes 0.021" is a good gap if you still have the standard ignition system.

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Do you have a fibre washer on the bottom of that bolt? Put one in there and it may tighten everything up.

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5 hours ago, feetupfun said:

The top ring of the filter is normally the only thing used to seal the top side of that banjo joint. There may be a minute defect in the filter ring or either of the metal surfaces. There is no law against using a bit of sealant there.

Other possibilities include a tiny hole or crack in the bowl or the banjo bolt thread bottoming out.

A protruding tip plug is better for that motor. I use BP5ES and BP6ES. Yes 0.021" is a good gap if you still have the standard ignition system.

 The bolt appears to tighten fine, I'll try a little sealant first before ordering a whole kit. And I'll try the BP6ES plug. Thanks!

 

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3 hours ago, bullylover said:

Do you have a fibre washer on the bottom of that bolt? Put one in there and it may tighten everything up.

Yes, I do have the fibre washer  at the bottom. Looked like the gas was coming from the top of the banjo filter. Going to try a little sealant  as Feetupfun said. Thanks!

 

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The banjo’s have a habit of distorting, due to overtightening, three solutions, buy a new one, try and resurface it with 1000 grit on a flat surface or use gasket cement - I’ve tried all three numerous times - never been particularly successful with the resurfacing bit  ?, hope this helps. Cheers 

Edited by paulmac
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