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Fuel Filters

I finally got a #3006 Napa fuel filter. A post to the Listserv carried some warnings about a rather short life for filters with paper elements. I never had a chance to test the life of the first filter, below, but who wants to find out at sunset, 50 miles from Moosomin anyway.

Vital Statistics:

  • Length overall - 4"
  • Diameter at widest point - 1 3/8"
  • Outside diameter of inlet & outlet - 5/16"
  • Recommended change interval - 15,000 miles

The elbow is on the carburetor end.

My local Napa store didn't have the #3006 (90 degree) or #3007 (straight through) fuel filter when I first went looking so I bought a #33011. Cost about $5. It covers two sizes of fuel line and is a see through case so you can see the little cooties accumulate.

Make sure you look for the arrow indicating direction of fuel flow. I hit mine with a black felt pen so I didn't forget to pay attention.

I didn't shorten the hose to compensate for the length of the filter and it all seemed to fit back together just fine.

The last 1/4" getting the gas line on was pretty tight; hope it comes off a bit easier. If it's tough to get off, I'll get one with the lip near the end next time. Otherwise, the job was just a few minutes.

In June 2003 I installed one of these little chaps. When I installed my auxiliary fuel tank, I had to remove my Napa filter due to lack of room. Shortly thereafter, I got a big chunk of crap in the #1 float bowl. It interrupted a trip and cost me about $120 to re & re the carbs to get it out.

I checked on the Cog Listserv about these filters for fear that they may not flow enough gas. All responses were that they worked well and in fact were probably better than the bigger ones. The big Napa filters on a bike were the cause of a number of flow problems although I never had anything go wrong using one.

The dealer suggested buying two of these filters. The reason being that if they did clog up, they would do so sooner than the big filters. That could leave you sitting at the roadside. Considering they're only about $3, it was a no brainer. I bought an extra and will leave it on the bike. You might also consider a brass or plastic tubing splicer which you can buy for a dollar or two.

As usual, make sure you get the direction of flow correct.

The filter on the far right is the most recent addition to the collection. This came from the local dealer. It has a fine mesh, but not as fine as the cone shaped filter. For the truly anal, you might consider using the one on the far right upstream to catch the big chunks and conehead downstream a bit. If the cone model is too fine, it may clog up too easily although I can't say I've ever heard that complaint. I have been warned to always carry two in case it does get clogged though.

Article By: David J. Morrow

Updated January 2005 

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