Fuel Filter

The standard fuel filter mesh is actually very efficient at preventing particles of rust entering the carbs. However, many will fail to filter correctly as they are prone to distort and allow rust and other particles to enter the carbs and either block the jets or worse still cause the float needle to jam and flood the engine and or airbox with gas. This in turn may create a hydrolock and bend the con rod.

Note: Bypass of the filter only occurs if the petcock is on Reserve or Prime, is when the petcock is drawing from the bottom of the tank.

Pictures to be posted on the right.

I believe the distortion is created by the filter sleeve being slightly too large for the recess in the top of the petcock, this causes the filter to distort inwards creating the gap.

I am not sure the best way to fix them. They are not easy to remove as they are such a tight fit.
Possible options are:

  • plug hole with JB weld and let it cure for at least 24 hours.
    This is what I did, likely the JB will soften over time, but I suspect it will hold.
  • plug hole with a sliver of rubber from an 0'ring
  • Replace the filter sleeve and perhaps trim the new sleeve so it does not distort

Article Written By Colin April 2012

I have seen the screens deform and create a small gap but it wont matter what position the petcock is in.
 ALL fuel passes through the screen. If there is a hole in the screen then there is a hole all the time in any petcock  position. Use a gas tank sealer product made to resist fuel. Colin is right about JB weld, it does go soft in gas in time. Instant JB weld  does not last long.

Just one more reason to get overflow tubes. Floats stick, they always have and they always will no matter what you do to prevent it.

Comments made by Daytona_Mike

Seal All is well suited to this application. Cheap, easy to find and use and it dries resistant to almost everything including gas and diesel.
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