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Thread: M35a2 injector return line fittings

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    4 Star General acesneights1's Avatar
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    Default M35a2 injector return line fittings

    I realize people have reused the nuts with new or ground down collars etc but I am an anal curmudgeon and wanted the right fittings. They are used for gas pilot lines.
    Here they are. I did mine today and they were the exact right fitting and the job came out nice. Don't forget inserts as well.
    BTW My lines were so brittle as I tried to take them out they all snapped with minimal effort.
    http://www.supplyhouse.com/Jones-Ste...-Breakaway-Nut
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    1985 AM General M923 Super Singles

    1986 M1008
    NV4500 Swap(the way they should have come)
    4 inch lift
    Raptor Lp
    5" Redneck Master Exhaust
    GM4 Turbo
    Serp Belt conversion
    1973 M35a2
    1974 M813
    1967 M105a2 camper conversion
    Mep002a on M103

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    Default

    Great Job.

    I see that the part number for these fittings is C74-158LF.

    Do you happen to have a source and part number for the insert?

    Also, where did you get the line? What size and part number.

    Thanks

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    Default

    The insert (compression sleeve) is attached to the 1/4 brass nut, make sure the old one comes out With the fuel line
    You can get line from most auto parts stores just make sure it's fuel rated

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    oddshot (08-10-2014)

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    Ah yes...... something else I should do. At least it is on top, instead of on the bottom of the truck. Thanks for the reminder.

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    Quote Originally Posted by Ja1904 View Post
    The insert (compression sleeve) is attached to the 1/4 brass nut, make sure the old one comes out With the fuel line
    You can get line from most auto parts stores just make sure it's fuel rated
    It snaps off when torqued down so not reusable. I used Synflex. No issue.
    1985 AM General M923 Super Singles

    1986 M1008
    NV4500 Swap(the way they should have come)
    4 inch lift
    Raptor Lp
    5" Redneck Master Exhaust
    GM4 Turbo
    Serp Belt conversion
    1973 M35a2
    1974 M813
    1967 M105a2 camper conversion
    Mep002a on M103

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    Quote Originally Posted by oddshot View Post
    Great Job.

    I see that the part number for these fittings is C74-158LF.

    Do you happen to have a source and part number for the insert?

    Also, where did you get the line? What size and part number.

    Thanks
    I posted the link where I got them. Just used plain old Synflex airbrake hose. Can get it at any Truck parts and most NAPA.
    1985 AM General M923 Super Singles

    1986 M1008
    NV4500 Swap(the way they should have come)
    4 inch lift
    Raptor Lp
    5" Redneck Master Exhaust
    GM4 Turbo
    Serp Belt conversion
    1973 M35a2
    1974 M813
    1967 M105a2 camper conversion
    Mep002a on M103

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    Sorry to revive and old thread, but I am about to repair the leaky return lines on my M756A2. From the photo at the top of this thread it looks like the same compressions sleeve for a common 1/4" compression fitting available at any hardware store. Can someone confirm that please?

    Also, the original clear hose was nice to monitor fuel line leeks, but I am not familiar with the hose itself. So, I ordered 1/4"OD Teflon tubing from someone on eBay, which should be clear enough to see bubbles if there are any, and robust enough to last decades. Does anyone know exactly how many feet of 1/4"OD tubing is needed to completely replace all of the return lines?
    1969 M756A2 running on WVO plus gasoline

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    4 Star General Jeepsinker's Avatar
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    4-5 feet is more than enough.
    I sink Jeeps... That is all
    1969 Kaiser Jeep M35a2 w/winch (Daily driver, no joke)
    Now a hot rod deuce: 6BT swap in progress, Waterloo overdrive, 2 micron fuel filtration installed, riding on 11.00r20s
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    Quote Originally Posted by Beyond Biodiesel View Post
    Sorry to revive and old thread, but I am about to repair the leaky return lines on my M756A2. From the photo at the top of this thread it looks like the same compressions sleeve for a common 1/4" compression fitting available at any hardware store. Can someone confirm that please?

    Also, the original clear hose was nice to monitor fuel line leeks, but I am not familiar with the hose itself. So, I ordered 1/4"OD Teflon tubing from someone on eBay, which should be clear enough to see bubbles if there are any, and robust enough to last decades. Does anyone know exactly how many feet of 1/4"OD tubing is needed to completely replace all of the return lines?
    The "correct" compression sleeves are not the same as plumbing compression sleeves.

    However, I used plumbing compression sleeves on my truck when I replaced my return lines. They worked just fine. Not even a damp spot around the fittings.
    "Turning pipe to the right"

    1972 Am General M35A2- Most common question-What do you do with it? My most common answer- Get ice cream.

    "I don't always downshift, but when I do its next to a Prius so the driver can hear me hurt the environment."

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    Quote Originally Posted by Ja1904 View Post
    You can get line from most auto parts stores just make sure it's fuel rated
    Regular DOT air tubing works fine but it's not fuel rated per say. It's actually rated for air but will work fine without any problems.

    I once used some plumbing tubing from Lowes for a return line because it was all that was available at the time and I needed to get home. The line got me home but soon turned very soft and wouldn't have lasted very long if I had left it on there.

    I've also run into problems with trying to use ferrules from a hardware store. The problem is that tubing is measured from the inside dia. and DOT tubing is much thicker than what they sell for plumbing so that means that plumbing ferrules are too small to fit over DOT tubing.
    The only member that ever gave himself a infraction point.

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