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  • Weber tuning

    Anybody that has got a successfully tuned Weber 38 out there please lend me a hand. I've read the book guide for setting up tuning, but it seems like I just never tune it good enough. I can be sitting at a red light, rev the motor real quick and it stalls out on me. Can't climb a hill of decent angle without it cutting off. Any help appreciated.

    1981 CJ7 258 I6 904 D300 Weber 38 Headers 4" BDS Suspension Currie shackles 35" BFG all with the legendary stock 2.72 gears!

  • #2
    weber carb on 258

    I've found if you don't have a elec. fuel pump with a low pressure output, about 3-4psi and a high volume flow you'll never get it working right. My mech. fuel pump was putting out about 8psi, it would blow right thru the float and needle valve of the carb.Flood the engine at an idle especially on down hill stops. Tried a mech. in line pressure reducer but starved the engine on high fuel demands.Can't recall the brand elec. fuel pump I got but can look it up if you"re interested.

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    • #3
      The hill thing is because you have a 4" lift. The engine is pitched to the back. You need a leveling plate. Detour makes a plate. I have one that I never used. Your carb is designed so you can go up steep inclines, the added pitch of the motor reduces the inclines you can climb. Look at your carb from the driver's side. You'll see the pitch. Weber carbs are high flow and low pressure. Use a holley high flow pressure reg. Don't use the Mr. Gasket turn a dial. it's not a high flow.That's what the guy at weber told me. Sounds like the psi is to high going into the carb.
      Last edited by Upper1; 02-13-2007, 11:22 PM.

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      • #4
        Upper. Are you talking to me?

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        • #5
          Why would I want to do that!

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          • #6
            I've always respected you u-uppers, worked with one. Sharp as a tack. But hey, Any one can shove it if they want.

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            • #7
              Hey the previous was an honest reply.
              Last edited by redtail; 02-13-2007, 11:44 PM.

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              • #8
                Still cold on the other side of the lake. I was in your backyard last year for a class. Nice town, but I like the woods better

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                • #9
                  I'm only replying to a 6 month problem I fought with my webber carb. The elec. fuel pump solved the problem. I have no ajenda. If I can help someone I will. By the way I live in the woods.
                  Last edited by redtail; 02-13-2007, 11:55 PM.

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                  • #10
                    I was messing with you on your reply. I went thru the same thing on my old 258. Best thing that happened to me was when I blow the old girl up and thru in a 304.when i read your's i remembered what the weber guy told me. so i added the holley reg to the post.

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                    • #11
                      Originally posted by Upper1
                      I was messing with you on your reply. I went thru the same thing on my old 258. Best thing that happened to me was when I blow the old girl up and thru in a 304.when i read your's i remembered what the weber guy told me. so i added the holley reg to the post.
                      I had it out with a co-worker at work today, I came here to take a break, OOPS just a little testy tonight, sorry

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                      • #12
                        Weber tuning

                        Well, thanks for the info and the mini discussion inside a discussion. About the leveling, I took care of that a while ago. Skid plate had these little 1 inch spacers between it and the frame. Got rid of those and that got rid of whatever driveline vibration the Tom Woods CV shaft didn't take care of, pluse made going into 4H and removing valve cover even easier. Think I will try the electric fuel pump. I'd appreciate if you found out the pump you got redtail. Thanks again.

                        1981 CJ7 258 I6 904 D300 Weber headers 4" BDS Suspension Currie Shackles 35" BFG Mud Terrains all on the legendary stock 2.72 gears!

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                        • #13
                          Carter4070 fuel pump

                          Go to http://www.racetep.com/webfuelspark.html. All kinds of good info on Weber carbs. and a ton of other stuff.By the way you'll need to check the float setting if you go with it. The high pressure pushed mine up until it hit the top of the carb body.By the way I cut a gasket for the new pump mount and it bolted right up to where the old mech. pump once lived.
                          Last edited by redtail; 02-14-2007, 08:13 PM.

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                          • #14
                            First off, do you still have the single inlet/dual out fuel filter? That will drop your fuel pressure to the carb to about 5PSI and the Weber will handle that fine. If not, you will need a regulator. The revving up and dieing at idle, plus the inability to tune it seems to me to be a float level problem. I've bought two Webers and in both cases, the float was too high right out of the box. The first one drove me nuts until I figured that one out. If that float is too high, you cannot tune it regardless. Your idle speed screw settings are your friend. Too far off in any direction with an out of box Weber and something is wrong. It's not hard to take the top off to check that float. Not losing the choke clip is the hardest part. Go here to see how to set the float: http://www.redlineweber.com/html/Tec..._breakdown.htm It's not hard at all. Hard to describe, dirt simple once you have the top off and look at it. The float is supposed to be perpendicular to the top for normal operation. Lower it a little away from the top for off road fun, but not too much or you will run out of gas at long full throttle runs. Check that float level.

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                            • #15
                              Hey TKCOMER you've got me rethinking my suggestions,I don't recall the sequence of installing elec. fuel pump and readjusting my float. Maybe I didn't need that elec. fuel pump? Well its running good now. I guess checking the float before buying an elec. fuel pump makes sense. It costs nothing to check the float. By the way I lost that choke linkage keeper when I reset my float.
                              Last edited by redtail; 02-16-2007, 06:00 PM.

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