'70 LS5 fuel pump and line confusion - NCRS Discussion Boards

'70 LS5 fuel pump and line confusion

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  • Justin S.
    Very Frequent User
    • July 3, 2013
    • 291

    '70 LS5 fuel pump and line confusion

    Below is a picture of my fuel pump. I don't have records of what I purchased but the inlet is facing away from the line and the S hose won't reach. Is there a different pump that would have the inlet clocked ~90* CCW?

    The other picture is the fuel line I purchased from Paragon. Could someone post a photo of how the line is ran along the frame? The picture in the AIM doesn't have all of the transitions that are on mine.
    Attached Files
  • Joe L.
    Beyond Control Poster
    • February 1, 1988
    • 43211

    #2
    Re: '70 LS5 fuel pump and line confusion

    Originally posted by Justin Sibbring (58615)
    Below is a picture of my fuel pump. I don't have records of what I purchased but the inlet is facing away from the line and the S hose won't reach. Is there a different pump that would have the inlet clocked ~90* CCW?

    The other picture is the fuel line I purchased from Paragon. Could someone post a photo of how the line is ran along the frame? The picture in the AIM doesn't have all of the transitions that are on mine.
    Justin------


    From what I can see of it, I don't think you have the correct fuel pump. It looks like a pre-1970 pump. 1970 LS-5 used a long cannister fuel pump. As I recall, the AC type number was 40770 but I can't say, for sure, because I'm out of town with no access to my references to confirm.
    In Appreciation of John Hinckley

    Comment

    • Justin S.
      Very Frequent User
      • July 3, 2013
      • 291

      #3
      Re: '70 LS5 fuel pump and line confusion

      Thanks, Joe.

      Can anyone help with the fuel line question?

      Comment

      • Patrick H.
        Beyond Control Poster
        • December 1, 1989
        • 11642

        #4
        Re: '70 LS5 fuel pump and line confusion

        If you Google "1970 Corvette frame" and click on images, you will find plenty of frames, restored and unrestored, to view.
        Vice-Chairman (West), Michigan Chapter NCRS
        71 "deer modified" coupe
        72 5-Star Bowtie / Duntov coupe. https://www.flickr.com/photos/124695...57649252735124
        2008 coupe
        Available stickers: Engine suffix code, exhaust tips & mufflers, shocks, AIR diverter valve broadcast code.

        Comment

        • Justin S.
          Very Frequent User
          • July 3, 2013
          • 291

          #5
          Re: '70 LS5 fuel pump and line confusion

          Thanks, Patrick. Sometimes it's the obvious solution.
          I've been scrambling to finish everything I can in order to get the body back on the frame so I can move.

          Comment

          • Allen N.
            Very Frequent User
            • January 1, 2003
            • 288

            #6
            Re: '70 LS5 fuel pump and line confusion

            Here are some pictures I took when I was taking my 70 LS5 apart:



            981.jpg982.jpg983.jpg

            I had to do some bending on the new lines I purchased to get them to where I was satisfied with them.

            Good Luck,
            Allen

            Comment

            • Justin S.
              Very Frequent User
              • July 3, 2013
              • 291

              #7
              Re: '70 LS5 fuel pump and line confusion

              Joe,
              I think the problem stems from ordering a gas tank without a return port. I used a pump part #6470424 in my catalog. I'll need to obtain a pump with a single outlet that faces the proper direction.

              Comment

              • Justin S.
                Very Frequent User
                • July 3, 2013
                • 291

                #8
                Re: '70 LS5 fuel pump and line confusion

                Thanks, Allen

                Comment

                • Joe L.
                  Beyond Control Poster
                  • February 1, 1988
                  • 43211

                  #9
                  Re: '70 LS5 fuel pump and line confusion

                  Originally posted by Justin Sibbring (58615)
                  Joe,
                  I think the problem stems from ordering a gas tank without a return port. I used a pump part #6470424 in my catalog. I'll need to obtain a pump with a single outlet that faces the proper direction.
                  Justin------

                  In that case, it's probably going to have to be a pre-1968 big block pump. However, I have no idea which one would have the inlet configuration you need.
                  In Appreciation of John Hinckley

                  Comment

                  • Justin S.
                    Very Frequent User
                    • July 3, 2013
                    • 291

                    #10
                    Re: '70 LS5 fuel pump and line confusion

                    Thanks, Joe. I'll look up some options. If nothing matches I'll fab a transition.

                    Hope you're enjoying the discounted Euro!

                    Comment

                    • Mark E.
                      Extremely Frequent Poster
                      • April 1, 1993
                      • 4525

                      #11
                      Re: '70 LS5 fuel pump and line confusion

                      Originally posted by Justin Sibbring (58615)
                      Thanks, Joe. I'll look up some options. If nothing matches I'll fab a transition.

                      Hope you're enjoying the discounted Euro!
                      Jerry-rigging a fuel system risks creating a new set of problems, including vapor lock due to no return system. Consider getting the correct parts.
                      Mark Edmondson
                      Dallas, Texas
                      Texas Chapter

                      1970 Coupe, Donnybrooke Green, Light Saddle LS5 M20 A31 C60 G81 N37 N40 UA6 U79
                      1993 Coupe, 40th Anniversary, 6-speed, PEG 1, FX3, CD, Bronze Top

                      Comment

                      • Justin S.
                        Very Frequent User
                        • July 3, 2013
                        • 291

                        #12
                        Re: '70 LS5 fuel pump and line confusion

                        I can't understand how this could be perceived as Jerry rigging if GM installed single port fuel pumps on production vehicles. A vented cap would solve a vapor lock problem

                        Comment

                        • Mark E.
                          Extremely Frequent Poster
                          • April 1, 1993
                          • 4525

                          #13
                          Re: '70 LS5 fuel pump and line confusion

                          Justin,

                          I respect your decisions about building your car how you want. Let us know how it works out. Yes, Chevy built 1970 Corvettes with and without return fuel lines (I believe all but LT-1 had them). But why do you think Chevy added a fuel return line for 454s? Would they have incurred this expense if a non-vented gas cap would work just as well?

                          The condition, originality of the car and your intentions for it may influence your approach as well. If it's a nice car, a more original approach may preserve its value enough to justify any added costs of finding the right parts.

                          And remember, you posted on the NCRS Forum, not Jalopy Journal. So expect feedback from curmudgeons like me.
                          Mark Edmondson
                          Dallas, Texas
                          Texas Chapter

                          1970 Coupe, Donnybrooke Green, Light Saddle LS5 M20 A31 C60 G81 N37 N40 UA6 U79
                          1993 Coupe, 40th Anniversary, 6-speed, PEG 1, FX3, CD, Bronze Top

                          Comment

                          • Brian M.
                            Infrequent User
                            • June 2, 2008
                            • 17

                            #14
                            Re: '70 LS5 fuel pump and line confusion

                            07421E13-2F71-470D-A423-2E2E0D70AE4C.jpgAAD5DE69-B01A-44C9-91EC-BAF92C1E8BCE.jpg37FED5C3-8906-481A-B964-56F9CA7169A8.jpg1CC33215-F31B-49B0-BAAD-46F76AB14213.jpeg
                            1970
                            Hope these help for the line issue. As for the pump here is a pic/LS5 (corvetteforum).

                            Comment

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