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Carburetor ID help and hard cold starting opinion needed

Discussion in 'Intermediate CJ-5/6/7/8' started by CJMark, Oct 6, 2015.

  1. Oct 6, 2015
    CJMark

    CJMark Jeeper

    Spearfish, SD
    Joined:
    Mar 7, 2014
    Messages:
    102
    Hello everyone, I need an opinion on my '75 CJ5 with 258 6 cylinder.

    Can someone confirm I have a Carter YFA based on pictures? Hopefully pics post ok. The number on the main body, above the throttle body, left side, is 70009A which I can't find on Mike's Carburetor page. So that's why I'm not sure.

    Second question, I have hard starting after CJ sets for a few days, I have to pump accelerator 6 to 8 times and crank starter maybe 4 or 5 times before it starts. Once it starts, or if it has only sat for a day, no issues starting. I absolutely have no other issues with the way the CJ runs.

    I suspect that I have a tired accelerator pump, looking down the air horn, I see some gas, but not a good squirt. But then going through the gears accelerating on highway there are no issues, runs like a champ.

    I don't think I have fuel pump check valve issue, because clear filter is full of fuel after setting. What's your thoughts? Is this just the natural of the beast?

    It's been like this for past 3 years, it's my daily driver in summer and when the weather is nice (no top on it) so I normally don't have this issue. Now that the Colorado weather is getting cooler, I don't drive it every day. I really don't want to mess with it because it runs so good, once started.

    Thanks,
    Mark


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    Last edited: Jan 14, 2018
  2. Oct 7, 2015
    scoutpilot

    scoutpilot Member

    Asheboro, NC
    Joined:
    Jun 7, 2014
    Messages:
    428
  3. Oct 7, 2015
    turbogus

    turbogus Member

    Albany, Oregon
    Joined:
    Sep 1, 2014
    Messages:
    215
    Yep, definitely you have a venerable Carter YFA, these are great little carburators, reliable and easy to work on. The only issue I've had on mine (in 'Easy Bake' my black Ford Panel van) is if varnish builds up around the choke butterfly it can get stuck closed.
     
  4. Oct 7, 2015
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
    Messages:
    23,596
    The float bowl is drying out. It takes a lot of cranking to deliver fuel to the bowl, if the bowl is dry.

    First thing to do is rebuild the carb, so that the gaskets seal tight. Keep the air cleaner on when the Jeep is sitting. This is not a typical problem with the YF, AFAIK, so you should be able to improve things a lot by sealing the evaporation paths from the float bowl.

    If you have an open element air cleaner, that's likely your problem. The design of the factory air cleaner slows evaporation through the bowl vents. The open element is like leavint the air cleaner top off.

    This is a parts store reman, as evidenced by the stickers on the body. Since it's not the factory carburetor, the stamping number may be different from what you would expect on a Jeep carburetor. Remanufacturers build carburetors to cover as many applications as possible, so don't panic if the number on the body comes from some other application. This just means that the builder picked a carb body from another application to make this carburetor. Almost certain that the previous owner (PO) bought a carb from a parts store that is meant as a replacement for the original carb, close enough so that it will function properly.

    Forget the theory that it's draining back into the fuel pump. That does not happen.

    Scoutpilot recommends a source for the proper rebuild kit. IIRC some of the kits out there try to cover too many applications, or are simply low quality, and don't seal up the carb the way they should.

    Good looking Jeep - I dig that blue valve cover.
     
    Last edited: Oct 7, 2015
  5. Oct 7, 2015
    CJMark

    CJMark Jeeper

    Spearfish, SD
    Joined:
    Mar 7, 2014
    Messages:
    102
    Thanks Scoutpilot for the link, I ordered a YFA kit from Mike's this morning.

    Tim, you've educated me and made look at the bigger picture. Thanks, never thought about reman carb and grabbing one from a pile (Ford or Merc) to rebuild so numbers would not match Jeep or original. Also, just the thought of fuel evaporating from the bowl most likely being the cause due to aged gaskets and checking the external fuel bowl pressure vent port (next to fuel inlet), it was plug on the reman carb, so I don't need the hose to the canister.

    My air cleaner, I believe is stock so shouldn't expect much evaporation from that area.

    Once I get the kit installed and had a chance to let it set for a few days, I'll make note to update this thread with results.

    Thanks for complement on Jeep, it's a damn good run-around vehicle and fun to drive. The value cover leaked 3 years ago so when I had it off I painted it Ford engine blue.

    Thanks again
    Mark
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    Last edited: Jan 14, 2018
  6. Oct 7, 2015
    turbogus

    turbogus Member

    Albany, Oregon
    Joined:
    Sep 1, 2014
    Messages:
    215
    Luckily the Carter YF and YFA's are an easy rebuild, it only took 30 minutes for the one on 'Easy Bake'
     
  7. Oct 18, 2015
    CJMark

    CJMark Jeeper

    Spearfish, SD
    Joined:
    Mar 7, 2014
    Messages:
    102
    Good news, the new kit from Mikes fixed my cold/setting starting problem. I also performed slight adjustment on the thermostatic coil tension to reduce gap on choke valve. Fires right up now after setting for a few days. Thanks everyone for help.

    The Mikes kit was complete and shipped out to me same day I ordered it, arrived in 3 days, installed it last Sunday, was about an hour and half job and an easy process, I had prepped myself with his YouTube rebuild videos. Definitely recommend Mikes Carburetor, very reasonable price too.
    Mark
     
    Last edited: Oct 18, 2015
  8. Oct 19, 2015
    turbogus

    turbogus Member

    Albany, Oregon
    Joined:
    Sep 1, 2014
    Messages:
    215
    Glad it all worked out, I really dig these YFA's
     
  9. Nov 12, 2015
    69Willys

    69Willys Las Vegas, NV

    Las Vegas, NV
    Joined:
    Nov 11, 2011
    Messages:
    902
    Mark, did you notice an improvement in acceleration after the rebuild? I seem to have the same thing going on with my Rochester 2G...runs really good, but not much squirt when working the linkage and hard cold starts. I think I'm due for a rebuild...
     
  10. Dec 15, 2015
    CJMark

    CJMark Jeeper

    Spearfish, SD
    Joined:
    Mar 7, 2014
    Messages:
    102
    No difference in acceleration after rebuild, runs and accelerates pretty much same after rebuild, big difference in starting after rebuild. The kits are not expensive and not hard to install, so I'd recommend rebuild kit.
     
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