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Fuel Systems, Fuel Injection, Carburation, Supercharging Fuel Systems, Fuel Injection, Carburation, Supercharging, Questions and answers.

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Old 02-15-2017, 01:57 AM   #1
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Default *Fuel line help

I'm planning on using this fuel filter on a new steel fuel line between the fuel pump and carburetor which will require two short pieces of rubber fuel line. I will need to find a way to make a bubble flare like what's on this filter and use hose clamps. Any ideas how to make the bubble flare?
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Old 02-15-2017, 07:11 AM   #2
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A flaring tool for tube of the same size (either 5/16" or 3/8" depending upon what your fuel line size is)...... Will not make such a barbed end. So don't try that (flared end those make will only end up cutting your hose from the inside when pushed over it).

However, fuel line hose of the correct size should fit snugly over the plain ends of your metal fuel lines and after you tighten your clamps...... Should hold a good tight fit so long as your fuel line pressure is correct for a carburettor (5 to 7 PSI max for modern carbs and 2-1/2 to 3 PSI max for vintage carbs such as Stromberg 97s, etc...... These older carbs require a fuel pressure regulator to keep fuel pressure at correct PSI).

Might add...... Although I have not found it necessary to do so in a great many years...... If you want some added insurance against leaks...... Make your hoses a little longer than necessary (extra 1/2" to 3/4" or so)...... And on the plain ends of your tubing where you have no barbed ends...... Push your fuel line on farther and use 2 clamps at that end of your hose.

Also...... Now of days, when you go to the auto parts store...... In addition to regular fuel rated hose...... You can also get hose in same size spec'd for fuel injection that is rated at higher pressure. Use that if you can. Its a little stiffer and stronger.

Make your new fuel line so as not to be too close to engine (keep it cool) and place the fuel filter that goes between fuel pump and carb in the vertical run just above fuel pump so if you do have a leak some day, the gas won't drip down on a hot engine as it would if your hose and filter were up close to carburettor. Personally, I have always run 2 fuel filters. One on each side of fuel pump. And I prefer the steel type that is meant for fuel injection setups (stronger outer body). In any case...... Whatever filter you choose...... NEVER use one with a plastic body. They are a fire looking for a place to happen.

Hope this helps,

Harry
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Old 02-15-2017, 10:16 AM   #3
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My advice...Save yourself some future grief and DO NOT use a rubber fuel line...This should be only a temporary measure at best....I did the rubber thing on mine for a while and it was always springing leaks for time to time....Got tired of that...So, I built a hard line from the pump to the carburetor.

Although this engine is gross looking for a guy giving you advice, the new plumbing is a lot more safer and mechanically sound.



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Old 02-15-2017, 10:39 AM   #4
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Let me encourage you to take Harry and Dave's advice. Take a pass on the glass filter and rubber connectors. Its just trouble waiting to happen. Use hard lines or braided lines. Might take a little fiddling with to get it right but in the end you will be much happier and safer.
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Old 02-16-2017, 09:43 AM   #5
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Agree with all the above, mostly. I ran the Glass filter for many years without issue. Primarily to see what exactly was passing through it and looks kinda cool. Last year rethought the process because of its location and the filter has been clean. I have since installed a metal filter and used the EFI rubber line which as the guys said is much stiffer and has more reinforcement inside but used the least length possible and did not see the need to use a bubble flare. Not saying it is a good idea. Once I clamped it I tried to pull it off by hand, would not budge. I did run a metal line from the pump to carb. Definitely do not use a plastic filter they are junk these days and a disaster waiting to happen. Not like the old days.
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Old 02-16-2017, 02:47 PM   #6
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y'all make good points that I haven't thought of. So now I am considering using this one under the car.
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Old 02-16-2017, 06:33 PM   #7
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Now you are cooking with gas! You do want to put one after the pump though. If the fuel pump diaphram begins to deteriorate it will send junk to the carb. Lots of guys use one before the pump and one after.
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Old 02-17-2017, 12:38 PM   #8
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Red face Excellent Point

Hmmm Good observation If that was a test, You passed Mike. !! Never thought of that happening !
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Old 02-17-2017, 01:31 PM   #9
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Only because I had it happen to me when I was younger. It was in the late 70s when the stations were selling "gasahol." Thought I was being slick hiding the filter before the pump. Then I made the mistake of filling up with some of that junk gasahol. Turned every bit of rubber to a crumbling mess, including the fuel pump diaphragm. I had to replace the pump, rebuild the carb, flush the lines. What a mess.

Gasahol and graphite oil. It was the 70s!
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Old 02-17-2017, 04:46 PM   #10
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I agree with what Harry said about mounting the filter vertical from the pump. I used a filter similar to the one below so I could eliminate rubber hoses. Just flare the tube to 37 Deg's and get a couple AN flare fittings and presto, no more rubber crap.
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