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Re-routing fuel line ?

Discussion in 'Early CJ5 and CJ6 Tech' started by molsenice, Jan 24, 2008.

  1. Jan 24, 2008
    molsenice

    molsenice Member

    Glens Falls, NY
    Joined:
    Jan 9, 2007
    Messages:
    235
    I am re routing the fuel line to the passanger side frame rail to get it away from teh exhaust.

    Also, I have picked up a new sending unit since the origonal one did not far well in testing it's operation, the ohm ratings were inconsistant and all over the place, so I ordered a new one. The origonal had a single tube comming out, the new one has 2 - one is obviously for a return line. Currently, I do not have a return, the line comes from the tank, to the mechanical fuel pump finally, to the YF carb.

    My question: Could I pick up one of those fuel filters with one nipple in and 2 out, and route the second nipple back to the tank as a return?
     
    Last edited: Jan 24, 2008
    molsenice, Jan 24, 2008
    #1
  2. Jan 24, 2008
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
    Joined:
    Jul 30, 2003
    Messages:
    8,526
    I assume you meant filter, not fuel line.
    yes.
    You could if you choose.
     
    jpflat2a, Jan 24, 2008
    #2
  3. Jan 24, 2008
    molsenice

    molsenice Member

    Glens Falls, NY
    Joined:
    Jan 9, 2007
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    235
    R) man got beat on the edit - and I saw it the minute I cliked the "post" button, yes - fuel filter
     
    molsenice, Jan 24, 2008
    #3
  4. Jan 24, 2008
    molsenice

    molsenice Member

    Glens Falls, NY
    Joined:
    Jan 9, 2007
    Messages:
    235
    I guess my thinking is getting the better of me - what about fuel pressure to the carb? - would the fuel not want to follow the path of least resistance and head for the tank, vs. going to the carb? - and then - should I put a check valve in the return line, to keep it from allowing air into the system, I'm thinking it would allow the line to drain from the carb back to the tank and I would only have what is in the bowl of the carb for the next start up, till the fuel pump refiled the system

    I guess I'm over thinking this and should try it and then worry about it if I find a problem
     
    molsenice, Jan 24, 2008
    #4
  5. Jan 24, 2008
    w3srl

    w3srl All-around swell dude Staff Member

    Port Orange, FL
    Joined:
    Nov 6, 2002
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    4,275
    I think the simplest method might be to just plug the second nipple in the sending unit since you don't have a return line.

    Also, heat shouldn't be much of an issue on the left side of the engine if you follow the factory routing path. The fuel pump is on the left side of the engine, so if you route the fuel line up the right side of the engine you are still going to have to cross over to the left and then up to the carb. As long as you have good, solid steel lines and a fuel pump in good condition you shouldn't have any vapor lock issues.

    I run an L-head, which is not exactly known for it's cool running characteristics and I haven't had any problems even on 100* days in traffic. I used preflared lines from my FLAPS to run from the pump up to the carb and used a tube bender to get nice rounded bends where I needed them. Turned out nice!
     
    Last edited: Jan 24, 2008
    w3srl, Jan 24, 2008
    #5
  6. Jan 24, 2008
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
    Joined:
    Jul 30, 2003
    Messages:
    8,526
    the return outlet on the filter will be 1/4" (some are even 3/16"); the fuel filter inlet/outlet are 5/16". The pump will put out the 3-4 lbs of pressure regardless.
    There are some folks who rotate the filter so that the return nipple is at the top, or above the filter outlet to prevent siphoning or drainback problems.
    Personally, I agree with Steve and would just go without it.
    But, it's your Jeep.
     
    jpflat2a, Jan 24, 2008
    #6
  7. Jan 24, 2008
    Walt Couch

    Walt Couch sidehill Cordele, Ga. 2024 Sponsor 2023 Sponsor 2022 Sponsor

    cordele, Ga.
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    Mar 29, 2007
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    Your gonna screw yourself up trying to run that second filter connection back to tank, (return). Your thinking is correct - the gas will go to the path of least resistance which is back to tank. Yes you will get gas to carb, enough for idle, but starve on hard pull (lean burn). Your best bet is plug that return pipe at tank and get a vented cap.
     
    Walt Couch, Jan 24, 2008
    #7
  8. Jan 24, 2008
    molsenice

    molsenice Member

    Glens Falls, NY
    Joined:
    Jan 9, 2007
    Messages:
    235
    glad I asked - will plug the return nipple and install the tank tomorrow

    Saturday my son is at a wrestling tournamentr and the plan is to take her out for her first ever test run SUNDAY

    thanks all
     
    molsenice, Jan 24, 2008
    #8
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