Autolite 4100 fuel filter

JC Mustang

Founding Member
Nov 1, 2000
142
0
0
Layton, UT
I've got a new filter for my Autolite 4100. It does not have tapered threads, which leads me to believe that a seal is formed through mechanical force, and that no thread sealant would be needed. Is this correct? Should I tighten this any more than hand tight?

Thanks.
 
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2+2GT

10 Year Member
Apr 25, 2009
3,333
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79
Southeastern Pennsylvania
The 4100 (and 2100) used two different filters, depending upon when they were made. The later ones had tapered pipe thread, but the earlier units had an inverted flare connection. The inverted flare should not be installed with thread sealer, since the threads do not seal the connection.
 

65FBE2

Member
Mar 8, 2007
283
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Minnasnowta
Look into the end of the carb and see if it has a backward looking funnel. What year is the carb? all 65 and older carbs had the inverted flair
 

JC Mustang

Founding Member
Nov 1, 2000
142
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0
Layton, UT
Hmm, I thought I already posted this, but I guess I messed it up.

Yes, inside the fuel inlet looks like a backwards funnel. The foot is stamped 6ZE.