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My 79 Marquis

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    #91
    Remind me and I'll bring you a good float next weekend.
    Get some Permatex Motoseal for the sender gasket, that's what we ended up using when we replaced the pump/sender hanger assembly on The Ice Car.
    Kishy had found a source for sending units but I'm not sure if it was right for carb application.

    That sender is doable without dropping the tank.
    Vic

    ~ 1989 MGM LS Colony Park - Large Marge
    ~ 1998 MGM LS - new DD
    ~ 1991 MGM LS "The Scab"
    ~ 1991 MGM GS "The Ice Car"

    Comment


      #92
      Thanks Vic!
      I will get ahold of Kishy about the sending unit. Looking forward to the Repairathon.



      1978 Grand Marquis 460 2door "Blue Bomber"

      1987 LTD Crown Vic Canadian Tow Package 351w aka the "MI Mountie"

      1989 Colony Park ....Marge still lives!

      1979 Marquis creamy goodness

      Comment


        #93
        From this thread
        http://www.grandmarq.net/vb/showthre...ding-Unit-Carb
        you can probably track a sending unit down. Part numbers sprinkled throughout that thread.
        Vic

        ~ 1989 MGM LS Colony Park - Large Marge
        ~ 1998 MGM LS - new DD
        ~ 1991 MGM LS "The Scab"
        ~ 1991 MGM GS "The Ice Car"

        Comment


          #94
          From where the gas seems to be coming from, it's hard to be sure what's wrong on yours. It looks from that pic like the tank failed and it's leaking from around where the sender goes, but very likely it isn't the tank, and it's either the gasket or the sending unit has a hole through it like mine does. With the rust on yours, it is very likely you have the problem I have, and probably a new sending unit is the right answer...but diagnose it further before assuming that.

          Be warned though, if it's like mine, disturbing it might reveal more failures as rust chunks break off. You should have access to a secondary vehicle before messing further with this, or get all the possible "what if" parts on-hand first. Consider that if you go in assuming it's just the gasket, and then during removal the fuel line nipple breaks off, and you discover it wasn't the gasket at all but instead a tiny rust hole through the metal plate...you're going to have a bad time.

          I will suggest that you probably need to pull the sending unit to examine exactly where the leak is. It might be, for example, coming through around the black plastic bit where the connector plugs in.
          You will need to get the fuel level down lower and my approach to this is to drain it into gas cans via the fuel line in the engine bay. I use an old EFI fuel pump to do this but manual siphoning would work...ugh, gross.

          You will want a new gasket and probably lock ring on hand, and it would also be smart to have new fuel line to replace the short length that attaches to the sending unit, as removing it will likely reveal it is in bad aged condition. As your float is bad, you also want a float on hand as well. Sounds like Vic has you taken care of for that. I've taken a liking to the plastic floats (of the exact same shape and dimensions as original) which are usually marketed towards Jeep guys...lots of vehicles used the same float as us for decades.

          Yes, that thread Vic linked is the repository of all my knowledge about the carb sending units. You need the carb-specific variant because the EFI ones (even CFI) do not have the pickup tube and fuel line fitting, they are actually built the same but the EFI ones have the tube cut short and plugged so it doesn't have an open end through the mounting plate.

          Lock Ring:
          Ford C0AZ-9A307-B (likely does not include gasket if it is original Ford part)
          Spectra Premium LO03 (that is letters LO, numbers 03)(does include gasket)
          Carter TLR3 (does include gasket)
          Dorman 579-003 (does include gasket)

          Gasket alone is Ford C0AF-9276-A, but if ordering from a dealer, it may only be available in a 10-pack now, and it also may be very old stock. If you do not have the proper lock ring wrench (I might be the only person on earth who has it), you should get a new lock ring.

          Float:
          The plastic one I've used (successfully for a couple years now) is Omix-ADA part number 17729.01
          If installing a used brass float I would suggest putting it fully submerged in gas for a bit and making sure no air bubbles come out of it anywhere, if any do, it is going to sink over time.

          The pickup strainer/filter inside the tank on the end of the pickup tube is D1FZ-9A011-A. Reproductions of this are available. If you find a version with a different number, it might be the 3/8" version...you need the 5/16".
          Last edited by kishy; 06-13-2021, 01:11 PM.

          Current driver: Ranger
          Panthers: 83 GM 2dr | 84 TC | 85 CS
          | 88 TC | 91 GM
          Not Panthers: 85 Ranger | Ranger trailer | 91 Acclaim | 05 Focus
          Gone: 97 CV | 83 TC | 04 Focus | 86 GM
          | Junkyards

          Comment


            #95
            Here is a tip for anybody removing/replacing a gas gauge sending unit. Use a MOPAR gasket part# 03404451 instead of the Ford gasket. The MOPAR gasket is wide and flat and fits inside the ridge where the sending unit sits in. The sending units are made from the same manufacturer for many U.S. built cars. Even the lock rings interchange. Nothing is harder than trying to hold that skinny o-ring in a vertical position and getting it positioned properly. You can buy the MOPAR gasket at any Jeep or Dodge dealer and they come one to a package! WagonMan
            89 Colony Park
            90 Colony Park
            70 HEMI Daytona Convertible

            Comment


              #96
              Originally posted by WagonMan View Post
              Here is a tip for anybody removing/replacing a gas gauge sending unit. Use a MOPAR gasket part# 03404451 instead of the Ford gasket. The MOPAR gasket is wide and flat and fits inside the ridge where the sending unit sits in. The sending units are made from the same manufacturer for many U.S. built cars. Even the lock rings interchange. Nothing is harder than trying to hold that skinny o-ring in a vertical position and getting it positioned properly. You can buy the MOPAR gasket at any Jeep or Dodge dealer and they come one to a package! WagonMan
              Thank you for that, definitely going to try it.
              This thread reminded me that my 83 has been parked waiting for this part (the sending unit), so I finally bit the bullet and bought one of the NOS ones kicking around on eBay. I'll try to get one of those Mopar gaskets and use that during the installation.

              As for the holding the gasket...I put vaseline on it, it kind of sticks it in position. But once the sending unit goes over top of it I always worry the gasket will get twisted or pop out of position. First fill-up at the pump I'm bent down looking under the car for leaks as I hold the pump nozzle.
              Last edited by kishy; 06-13-2021, 01:50 PM.

              Current driver: Ranger
              Panthers: 83 GM 2dr | 84 TC | 85 CS
              | 88 TC | 91 GM
              Not Panthers: 85 Ranger | Ranger trailer | 91 Acclaim | 05 Focus
              Gone: 97 CV | 83 TC | 04 Focus | 86 GM
              | Junkyards

              Comment


                #97
                Damn, thanks for all of the knowledge everyone.

                Kishy, it's a brand new tank, so I hope its not bad already or a lame one. On further inspection, the black pooling under the fuel tank sending unit was the rubberized undercoating in the leaked gas....maybe while rust proofing the new tank some got sprayed in the hole, making a shit seal? Really tempted to yank the tank out as its only attached on one side and rigged on the other.....wagonman hooked me up with the right mounting part. I could reseal it, fill it up with water and check it while its suspended.....drain and remount when good to go.

                Finally had a good day as everything I touched didn't go to hell in a hand basket. New rotors, wheel bearings, calipers, pads and brake hoses on each side. Master cylinder and brake booster removed

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                1978 Grand Marquis 460 2door "Blue Bomber"

                1987 LTD Crown Vic Canadian Tow Package 351w aka the "MI Mountie"

                1989 Colony Park ....Marge still lives!

                1979 Marquis creamy goodness

                Comment


                  #98
                  Here is another tip. You don't have to fill the tank with water. Install the sending unit, hold the tank so the sender is upright, pour water on top of the sender so it pools. Look inside the tank from the filler neck hole and see if water is dripping inside. WagonMan
                  89 Colony Park
                  90 Colony Park
                  70 HEMI Daytona Convertible

                  Comment


                    #99
                    Originally posted by Grand1 View Post
                    Finally had a good day as everything I touched didn't go to hell in a hand basket.
                    The problem is you literally live right down the road from Hell, so it doesn't take much for things to go there basket or no basket.

                    I found that good float, I'll bring it next weekend since we know yours has a pinhole.
                    Vic

                    ~ 1989 MGM LS Colony Park - Large Marge
                    ~ 1998 MGM LS - new DD
                    ~ 1991 MGM LS "The Scab"
                    ~ 1991 MGM GS "The Ice Car"

                    Comment


                      Thanks...and I will to get that Mopar gasket, Hell is hot.



                      1978 Grand Marquis 460 2door "Blue Bomber"

                      1987 LTD Crown Vic Canadian Tow Package 351w aka the "MI Mountie"

                      1989 Colony Park ....Marge still lives!

                      1979 Marquis creamy goodness

                      Comment


                        Originally posted by WagonMan View Post
                        Here is a tip for anybody removing/replacing a gas gauge sending unit. Use a MOPAR gasket part# 03404451 instead of the Ford gasket. The MOPAR gasket is wide and flat and fits inside the ridge where the sending unit sits in. The sending units are made from the same manufacturer for many U.S. built cars. Even the lock rings interchange. Nothing is harder than trying to hold that skinny o-ring in a vertical position and getting it positioned properly. You can buy the MOPAR gasket at any Jeep or Dodge dealer and they come one to a package! WagonMan

                        Hey WagonMan, do you have a year, make, and model for that gasket seal? Like a 1962 Fury? I called two parts dealerships and both are coming up empty on that part number. There are some online options with that part number (like Amazon for over $80, lol or ebay with a long ship time).... maybee it changed?

                        Edit: both dealerships "catalogs " only go back to 1982. Never understood that, while technology can save about anything, at minimal cost. Both places didnt even give a shit.I was a part specialist for a Uhaul regional repair center in Virginia and held myself to a higher standard than that, even on Monday mornings.
                        Last edited by Grand1; 06-14-2021, 10:36 AM.



                        1978 Grand Marquis 460 2door "Blue Bomber"

                        1987 LTD Crown Vic Canadian Tow Package 351w aka the "MI Mountie"

                        1989 Colony Park ....Marge still lives!

                        1979 Marquis creamy goodness

                        Comment


                          Here is a pic of the package. I thought the "1" in front of the # meant one piece. Maybe it is part of the part#. As far as application, I use any Mopar up to 1990. WagonMan
                          Attached Files
                          89 Colony Park
                          90 Colony Park
                          70 HEMI Daytona Convertible

                          Comment


                            #1 seems to mean 1 pc.

                            https://www.ebay.com/p/9034975571
                            https://www.ebay.com/itm/333216623541
                            https://www.ebay.com/itm/233629275729
                            1985 Mercury Grand Marquis LS, "Maisa"
                            1995 Chevrolet Caprice Classic STW, "Sally"

                            Comment


                              Bench bled master cylinder , booster, vaccum line on. Many thanks to Vic for the help with the brake lines.....no way I could have done it alone.Put a Wildwood proportioning valve on which can also be used for rear rotors in the future. Had to get creative with the bracket and positioning it. Master cylinder lines where tough do to the angle of the valve. Please send good vibes this way as I am gonna brake bleed and check for leaks.

                              Click image for larger version

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                              Last edited by Grand1; 06-23-2021, 11:48 AM.



                              1978 Grand Marquis 460 2door "Blue Bomber"

                              1987 LTD Crown Vic Canadian Tow Package 351w aka the "MI Mountie"

                              1989 Colony Park ....Marge still lives!

                              1979 Marquis creamy goodness

                              Comment


                                Crap, I forgot to bring that float to you. I'll have to remember to bring it with to Derek's place this weekend.
                                I'm sitting here staring at the float and realized I was supposed to bring that with me last weekend.

                                That Mopar seal is great. The one that came with the lock ring is so thin.
                                Vic

                                ~ 1989 MGM LS Colony Park - Large Marge
                                ~ 1998 MGM LS - new DD
                                ~ 1991 MGM LS "The Scab"
                                ~ 1991 MGM GS "The Ice Car"

                                Comment

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