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Old 09-12-2013, 07:45 AM   #1
racer32
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Default Fuel line size ?

Working on a late '31 with a Tillotson (if it matters). My fuel lines are a cobbled-together mess of mismatched pipe, AN, and brass fittings (former owner was an airplane guy). I plan to straighten out the mess, but in the meantime I have a few questions:

Will 1/4" tube be adequate to run the car at speed? If not, will it work for stationary testing?

Will an aftermarket fuel bowl that has 1/8" pipe threads in and out restrict fuel flow?

What size fittings work in the fuel shut-off and carb?
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Old 09-12-2013, 08:50 AM   #2
steve s
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Default Re: Fuel line size ?

The repro fuel line I bought from one of the suppliers is 1/4" OD. I expect it would work fine (haven't used mine yet). Sorry, can't help wit the other measurements, off hand.

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Old 09-12-2013, 10:07 AM   #3
Jim Brierley
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Default Re: Fuel line size ?

a 1/4" line will work just fine, go for it!
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Old 09-12-2013, 10:15 AM   #4
Tiny
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Default Re: Fuel line size ?

1/4" steel line as the others have said. Available at any local parts place. You'll need about 2.5' but buy 3' so you have some extra. DON'T use copper unless you have a good fire extiguisher.
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Old 09-12-2013, 03:03 PM   #5
racer32
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Default Re: Fuel line size ?

What about the carb and fuel outlet?? NOTHING at the hardware store seems to fit those threads. are they 5/16 flare?
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Old 09-12-2013, 04:06 PM   #6
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Default Re: Fuel line size ?

Not sure about the thread pattern or size. You use a brass 1/4" compression ferrel and the brass fitting. It could be flare thread. Im not sure. Was it missing the old ones?
Heres what you need:
http://parts.modelastore.com/show_Product.asp?ID=3892
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Old 09-12-2013, 05:05 PM   #7
jimvette59
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Default Re: Fuel line size ?

The thread is 1/2 X 20 tpi it is a special fitting you can get from any model A parts supplier. You can also order the correct fuel lines. JMO.
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Old 09-12-2013, 05:09 PM   #8
Purdy Swoft
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Default Re: Fuel line size ?

The fuel line should not be flaired. The fitting threads are 1/2 X 20 . Ferrules are used with the fittings as Tiny says above.
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Old 09-12-2013, 05:11 PM   #9
Purdy Swoft
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Default Re: Fuel line size ?

Sorry, I'm a little slow. Got a phone call when I was in the middle of my post
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Old 09-12-2013, 10:27 PM   #10
racer32
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Default Re: Fuel line size ?

Quote:
Originally Posted by Purdy Swoft View Post
The fuel line should not be flaired. The fitting threads are 1/2 X 20 . Ferrules are used with the fittings as Tiny says above.
OK, so the fuel lines themselves use compression fittings, then? Were the lines originally 5/16"? 5/16" compression fittings have 1/2" x 20tpi straight threads. I'm REALLY concerned about squeezing a brass ferrule inside that potmetal Tillotson!!! There was a steel flare to 1/8" pipe nipple in the carb end of the mess that was in there when I got the car.

FWIW, thread size for 5/16" flare is 1/2"x 20tpi, too...might explain prior owner's use of flared male to 1/8" pipe adapter in the fuel shut-off

Snyder's has a kit for late 31's without side-bowl carb...I know that should work, but I don't like the glass bowl hangs from the lines in their illustration. I also can't drive to their store and look at it before I buy.

Last edited by racer32; 09-12-2013 at 11:00 PM.
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Old 09-12-2013, 11:18 PM   #11
racer32
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Default Re: Fuel line size ?

Quote:
Originally Posted by Tiny View Post
Not sure about the thread pattern or size. You use a brass 1/4" compression ferrel and the brass fitting. It could be flare thread. Im not sure. Was it missing the old ones?
Heres what you need:
http://parts.modelastore.com/show_Product.asp?ID=3892
My car doesn't have those fittings.
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Old 09-12-2013, 11:26 PM   #12
Purdy Swoft
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Default Re: Fuel line size ?

The same fuel line and fittings fit both Tillotson, Zenith and all of the other upodraft carbs made for the model A that I know of. The same fittings and ferrules also work with glass bowl sediment bowl , cast iron sediment bulb and the cast side bowl used with the 1931 models. I've used steel brake lines from local parts houses as well as copper tubing with never a problem. Problems with copper tubing is highly over rated.
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