Fuel System Fittings
09-17-2014, 07:26 AM
#31
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I dont know the measurements off hand, although I do have them somewhere, buried. I had the 177, 250, and 420 blowers, on the same set of engines. If I were to do it over again, I would have skipped the 250 and went straight to the 420. The 420 is substantially taller than both of them though. Its close in size to an 8-71 dimensionally. Had them on the shelf next to each other this winter.
09-17-2014, 08:45 AM
#33
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My old line set up to the carb was a -8AN line to a Y in the middle of the valve cover, then fed both carbs, When I pulled that apart to put the dual feed set up on to clean it up a bit, mine had little tiny filters inside the feed ports on the carbs backed by a spring. I was advised to remove them since I have a 10 micron fuel filter and they weren't necessary or overkill. Sounds like thats something you are looking for, those little tiny screen filters
09-17-2014, 09:07 AM
#34
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This is a pretty big" thread" for thread sealer. Loctite 567 seems to work for me, thicker than Permatex, the Permatex has to be kneaded together before using. If you want that ultimate seal use some Loctite 545.
Just my Nickel's Worth.
Just my Nickel's Worth.
09-17-2014, 10:01 AM
#35
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Watch out for adding other filters into your fuel system. They can cause lean conditions. Remember you want balance of filtering and fuel flow, there is a trade off. You can never have the greatest filter that filters 100% of the smallest materials because that will restrict fuel flow. Also too many added fuel filters will restrict fuel flow and is very hard on fuel pumps. Just saying
09-17-2014, 10:16 AM
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I didn't add any fuel filters, just replaced the one that was there with a better flowing filter, and removed those 2 little small screens that were in the feed ports of the carbs
09-17-2014, 11:44 AM
#39
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That's correct about any filters coming out of the fuel tank before the electric fuel pump. They need to be 80 to 120 microns rated. That micron rating will not filter the small crap. Also electric fuel pumps hate to pull fuel - they do a whole better pushing fuel. If a filter before the fuel pump is too restrictive (finer micron rated filtering) it will shorten the life of it plus cause fuel flow restrictions.
09-17-2014, 12:15 PM
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The Mallory pump I believe is a specific pump that wants a pre pump filter as the littlest particles can kill it. I am pretty sure the holly has a built in screen to keep certain size debri out
