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Fuel Line I.D.?

 
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Old 10-05-2018, 03:14 PM
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Fuel Line I.D.?

Preparing for the Hutch/Harpoon and installing the RiffRaff in-line filter. The filter has -8AN male fittings, requiring a -8AN female to hose barb adapter. I want to simply remove a small section of the factory fuel line between the tank and pump, and replace it with the filter and fittings.

Q: What size hose barb will fit inside the factory fuel line? I've seen both 3/8" and 5/16" mentioned when replacing the line from the tank to the pump, but nothing that specifies what the existing line is internally.
 
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Old 10-05-2018, 05:02 PM
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Moved to the 7.3L PSD forum.

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Old 10-05-2018, 07:13 PM
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I used 3/8 barbs, with 3/8 fuel injection hose. Starting at the tank, I pushed the hose over the barb coming off the sending unit tripped clamped that one, then threaded hose to the RACOR filter 2 clamps, then on other side of RACOR 3/8” with 2 fuel injection clamps to the back side of the pump. I left the stock lines in place.
 
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Old 10-05-2018, 07:17 PM
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As long as 3/8" fit on the pump, that should do... I am hoping to re-use all of the stock fuel line.

Many thanks for the reply!
 
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Old 10-05-2018, 07:25 PM
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Ditto what John said, just leave the stock line there. It has the leaky QR fittings at both ends, you want to avoid them. Use new hose from tank to filter. 3/8 and I think it's 30R7 for diesel, then fuel injection clamps not worm drive clamps. Make sure the hose is routed well and supported, sometimes it can get pinched when putting the tank up. Extra hands very nice to have. I used 5/16 from filter to pump to match the pump inlet.
 
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Old 10-05-2018, 07:29 PM
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Originally Posted by aawlberninf350 View Post
Ditto what John said, just leave the stock line there. It has the leaky QR fittings at both ends, you want to avoid them. Use new hose from tank to filter. 3/8 and I think it's 30R7 for diesel, then fuel injection clamps not worm drive clamps. Make sure the hose is routed well and supported, sometimes it can get pinched when putting the tank up. Extra hands very nice to have. I used 5/16 from filter to pump to match the pump inlet.
Okay, that clarifies it - best practice is to NOT re-use the fuel line from the tank. Seems -8AN to 5/16" hose barb is hard to find, and I hate to use a mess of adapters, especially on the suction side.
 
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Old 10-05-2018, 08:29 PM
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Originally Posted by PrescottIce View Post
Okay, that clarifies it - best practice is to NOT re-use the fuel line from the tank. Seems -8AN to 5/16" hose barb is hard to find, and I hate to use a mess of adapters, especially on the suction side.
‘The 3/8” hose and barbs works perfectly. So guys like the 5/16 because it fits a bit tighter. No mess of adapters needed. Are you planning on using a RACOR filter?

I left a loop of hose in case I need to cut some off.

 
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Old 10-06-2018, 09:16 AM
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Very clean install Colorado350 . I always appreciate a measure of "service loop" in both hoses and wiring should the need to change ends or make other adjustments arise.

I have the small RiffRaff inline cartridge filter for now. Used lots of Racors in the marine industry, if the RiffRaff doesn't cut it I'll upgrade. Thanks for the pics!
 

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