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Subject: Another 641 fuel valve replacement

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Mike in Michigan    Posted 12-22-2019 at 21:40:55 [URL] [DELETE]        [Reply] [Email]  
  • Another 641 fuel valve replacement
  • My 641 leaking profusely from fuel tank valve (first time). Read a lot of history on this and other sites. There's no way I can remove that valve with everything in place as others have stated. Can't get flare wrench on and cant turn the screws that connect the valve to the tank. So it looks like I have to remove the hood and fuel tank. I've read where some say its a one man job - others two.
    Any gotcha's in removing the hood and fuel tank?

    Now on to the replacement strategy. First, I was looking at replacing the o-rings with viton. Second I wanted to run my own homemade line and use a separate shutoff more convenient near the bowl and just leave the valve open at two turns. Unfortunately someone had posted a how-to on this with pics but the pics are no longer there. I haven't decided on the shut off type - typical setup as others using the shutoff between to strips of rubber hose.
    I see that NiCopp tubing is more flexible than steel. Does anyone have experience using this for fuel line? And, you can buy pre-made finished lines with a fitting and flanged. Is there any specific threading to look for if I go this route or is all brake and fuel standardized?

    Tyler (MD)    Posted 12-27-2019 at 18:56:35 [URL] [DELETE]        [Reply] [Email]  
  • Re: Another 641 fuel valve replacement
  • I often thought about replacing my dad's 640's gas tank with a Jubilee/600 series replacement tank found on Ebay. Having replaced the shutoff value on his tractor 3 times. The Jube/600 series tanks have an option to use the existing spot for the shut off value in the center of the tank, or the spot where the Jubilee's sediment bowl was mounted near the side of the tank. You could just put a sediment bowl there, reroute the gas line and remove the sediment bowl that was directly mounted to the end of the carb.

    I often wondering why they changed the position of the shut off value on the 600 series tank. Too much of a pain to get to it.


    Mike in Michigan    Posted 12-28-2019 at 23:08:51 [URL] [DELETE]        [Reply] [Email]  
  • Re: Another 641 fuel valve replacement
  • Thanks for the info Tyler. If I go the route of replacing the tank I will definitely consider your approach. But those tanks are ebay are selling around $250 shipped.
    It sounds like if I use viton orings and swap the rivet for a screw I may be in a better position to handle future leaks.

    Tyler (MD)    Posted 12-29-2019 at 08:19:51 [URL] [DELETE]        [Reply] [Email]  
  • Re: Another 641 fuel valve replacement
  • Oh I agree. But if you had a rusty gas tank and didn't want to line it, the new tank would be an option.

    I think what you're doing will work. Drill out the rivet, replace the o-ring(s), and install a new screw (stainless?).


    Tim Daley(MI)    Posted 12-26-2019 at 14:45:30 [URL] [DELETE]        [Reply] [Email]  
  • Re: Another 641 fuel valve replacement
  • Can you post the LINK to the HOW-TO's article here with the pictures that are no longer viewable? I didn't see anything under FUEL SYSTEM. It's a good bet the pictures were saved with Photobucket and if sender did not renew with a fee-based account now are not able to post and they will be all blurred. If we see who posted it, perhaps we can get them to save under IMGUR or other account and repost the entire article with those. Question #2 - FITTINGS ARE SPECIAL UNS 7/16-24 USED ON BRAKE AND HYDRAULIC LINES. This includes sediment bulb connections, brass elbow fittings, and fuel line fittings. Many of us eschew using plastic, copper, nylon, or rubber FUEL LINES and advise NOT recommended to use. 1/4 Steel is best. A flaring nut tool kit and tubing bender are your friends. Are you anywhere close to Lapeer County? If so I could pop in and help you run new steel lines. Email is open.

    Tim Daley(MI)

    Mike in Michigan    Posted 12-26-2019 at 21:53:52 [URL] [DELETE]        [Reply] [Email]  
  • Re: Another 641 fuel valve replacement
  • Thanks for the reply Tim. Unfortunately I am down in Roch Hills area - a bit of a hike from you. The post was actually on another forum (https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=ford&th=500557) with the same Photobucket issue you described.
    I did remove the hood by myself with no problem but still have to remove the bolts for the gas tank (4 small and 3 large, one is missing). After looking at the amount of clearance I had from the manifold I decided to stay with steel line. I was thinking of buying this:

    I may still use the existing fuel line but noticed that it seemed to slant upward coming off the valve before going south. I thought that was supposed to cause vapor lock.
    If I do decide to run a new line, is there any issue with trying to straighten out a roll like the one above? Probably not be since they sell so many. I have a flare kit and bending tool on my list.
    Another thing I was considering on the valve rebuild, instead of replacing the rivet with a screw, how about just plugging it flush? Not sure what with. What would be the ramifications of not having a stop point for the screw?
    And yet another question comes to mind, there were no rubber bumpers at all, like:

    Are these helpful, and if so where do they get placed?

    Tim Daley(MI)    Posted 12-27-2019 at 08:59:13 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Another 641 fuel valve replacement
  • Mike-
    I replied to your email earlier today. You are not far away at all -30 miles maybe. I go to the Hills all the time. We will get tigejerr to discuss next week so don't buy any parts yet. There are a few better suppliers than Steiners. Just8ns and Dennis Carpenter are used by many here. Carpenter makes many of those parts anyway and others just buy from them. See you next week.


    Jim    Posted 12-27-2019 at 19:47:09 [URL] [DELETE]        [Reply] [Email]  
  • Re: Another 641 fuel valve replacement
  • Tim, that is really nice of you to help Mike out. Do you ever get to TN? Just kidding.

    Tim Daley(MI)    Posted 12-29-2019 at 07:06:11 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Another 641 fuel valve replacement
  • Not since I was 17! Four of us drove from Detroit to the Smokey Mountains in a '62 Volkswagen)to backpack over Easter Vacation when I was a junior in HS. It was and still rates as the best camping trip I ever did. Gatlinburg, TN was not the built up commercialized; circus it is now. There were a few restaurants, gas stations, and stores but nothing like it is now.

    Tim Daley(MI)

    Jim    Posted 12-29-2019 at 07:14:19 [URL] [DELETE]        [Reply] [Email]  
  • Re: Another 641 fuel valve replacement
  • I was there on my honeymoon in '63. I live on the Western side. Like you have no desire to go back. Have a great year.

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