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Old 01-14-2020, 09:32 AM   #1
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Fuel hose size

Anybody know what the standard fuel hose size would be between a 900 series racor to a 2715e mechanical fuel pump???
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Old 01-14-2020, 09:35 AM   #2
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Greetings,
Mr. B. Ours is 1/4".
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Old 01-14-2020, 12:00 PM   #3
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Mine is 3/8Ē.
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Old 01-14-2020, 02:02 PM   #4
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Mine is 3/8”
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Old 01-14-2020, 05:43 PM   #5
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I would research the pump and use the recommended inlet size. The Racor 900 should be able to handle any flow rate the pump needs.
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Old 01-14-2020, 06:34 PM   #6
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Everybody should have some type of caliper onboard. It's the only way to be sure.
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Old 01-14-2020, 06:37 PM   #7
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I use my digital calipers all the time, used them today.
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Old 01-14-2020, 06:48 PM   #8
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Mine is 3/8” too.
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Old 01-14-2020, 07:11 PM   #9
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at least for a 120hp...the limiting pipe is between the secondaries and the injection pump...it's only 1/4" or so (if some weird British or metric size I don't know)
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Old 01-14-2020, 07:13 PM   #10
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No trying to be a smart ass, but the fuel hose ID should be printed on the hose. That is if its not ancient Taiwan hose. When you buy a Racor, it comes with page listing of assorted fittings to choose from. Could be anything from 1/4" to 3/4"ID.
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Old 01-14-2020, 08:13 PM   #11
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Old 01-14-2020, 08:37 PM   #12
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Standard is whatever the PO installed. I think the original cu lines might have been 3/8 to secondaries, 1/4 beyond secondaries. I installed dual 500's and replaced line with 3/8 fuel hose.
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Old 01-14-2020, 09:48 PM   #13
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Racor does sell fittings that will reduce the huge hole in the 900 to 1/2”. Then you will need a reducing bushing to take it to 3/8”.
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Old 01-14-2020, 11:05 PM   #14
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Not only Racor but a good hydraulics shop will sell those ftgs. O ring boss. Take the filter with you and they should be able to match you up quite quickly.
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Old 01-15-2020, 08:11 AM   #15
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1/4" is good up to 200hp so if it's that size or larger you're fine. Use A1 fuel hose for whatever size your fittings are, changing fittings is easy and cheap, cheaper than hose. Racor fittings are widely available, I get the ones that have a female pipe thread so I can use the barb fittings of my choice. Double clamp and secure the hose runs, your Racor should be mounted at least below the top of your tanks and ideally level with your fuel pump.
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Old 01-15-2020, 11:01 AM   #16
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If running a line from tank to racor and then to engine, it depends on the length of the run and how many fittings and valves are in the path. Without knowing details of such, I would go with 3/8" ID hose and that should be fine. 1/4" probably fine (yes on the engine they already use this), but going some distance to the tank under suction it is better to size up a bit.

Racor fittings readily available in NPT fittings, then get an NPT to hose nipple fitting.
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Old 01-15-2020, 12:32 PM   #17
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Quote:
Originally Posted by Ski in NC View Post
If running a line from tank to racor and then to engine, it depends on the length of the run and how many fittings and valves are in the path. Without knowing details of such, I would go with 3/8" ID hose and that should be fine. 1/4" probably fine (yes on the engine they already use this), but going some distance to the tank under suction it is better to size up a bit.

Racor fittings readily available in NPT fittings, then get an NPT to hose nipple fitting.
A very good point, it costs only a little more to size up to 3/8 over 1/4.
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Old 01-16-2020, 12:44 PM   #18
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Thanks... See my recent thread for fuel tank disaster...
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