Topic: fuel filter

[tlbranth]

Haven't been on the forum for a while but way back there were discussions about inline fuel filters. I've tried them in the past and had air-lock problems. There was a member whose handle I don't remember fould a 90 degree filter he said worked well for him. Looked but couldn't find it. Anyhow, I'm having constant float sticking problems - different carbs - that I'm pretty sure is caused by funk from the tank. Any suggestions for filters that've worked for you appreciated.

[PeWe]

Clean the tank free from debris might be easier?
I have never had problems with dirt from tank.
I thought I had once but it was a rusty fuel cap with not working ventilation so bike stopped after 10-15 minutes.
Fuel started to flow when open the cap that look good on outside, inside very rusty.

I have also noticed that the rubber gasket must be mounted right.
If flipped the wider part can block the vent hole.
I had a cheap aftermarket fuel cap rubber gasket that was wider, I could not trust it when it partially blocked the vent hole.

[scottly]

Hi Terry! I've also had problems with the pleated paper type fuel filters, where it seems the gravity fed fuel pressure is too low to force any air trapped below the filter down past the needle valves. Mesh type filters don't seem to have this issue? I once found a filter at a boat/bike shop that had a one inch diameter wire screen set into a thin housing with a nipple on each end that was very compact, maybe 1 1/2 inches long or so from the end of one nipple to the other. Due to the small surface area of the screen, if there is a lot of sediment, they will plug up in a relatively short time. BTW, did you hear of Frank's passing?
Scott

[pjlogue]

Hey Terry,

I have tried using filters in the past on my 750 and I always have had problems with them causing fuel starvation, especially in warmer weather.  As PeWe suggested, make sure your tank is clean and free of rust/dirt fines that can make their way to the carbs and make sure the fuel cap allows proper venting.  Make sure the very small screens just up stream of he float valve seats are clean.  These are very fine mesh screens that sit atop the float valve seats and can become clogged easily from dirt in the fuel system or even varnish from long standing fuel. I have found that fuel tubing routing is also criticle.  Make sure there are no "n" bends in the tubing and the tubing is the shortest and straightest route to the bowls you can make.

Since you have tried a different set of carbs it would seem that the most likely cause  is fuel cap vent or fuel tubing routing.  If you do go with a filter, as Scottly said, use a fine mesh screen type and not the paper pleated.  When mounting the filter note and directional arrows on the body and have the filter on the up flow side of and "U" bends in the fuel tubing.

-P.