|
|
Post by street16 on Oct 24, 2013 14:46:28 GMT -6
My truck runs great for about 5 laps and then falls flat for about 2 seconds. Then it picks up and runs fine for a few seconds and falls flat again. This repeats until I pull off the track. I've replaced the MSD box, but it feels more like it's fuel related. I was thinking something was heating up and failing (hence replacing the MSD box). I have never had an engine vapor lock, but this doesn't sound like vapor lock symptoms to me. Any ideas? Thanks.
|
|
|
|
Post by lizardracing on Oct 24, 2013 23:03:36 GMT -6
Sounds ignition related to me. Verify timing. Verify it's not moving around. Slipping dizzy gear, loose dizzy reluctor, excessive dizzy end play and excessive cam end play for example.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 25, 2013 8:15:19 GMT -6
Do you run a fuel pressure gauge? A friend had the same type of problem this year, ended up the fuel pickup inside the cell had come loose from the fitting and every time the fuel sloshed the right way, the pickup sucked air at the fitting and the motor stumbled. IDK, something to check
Dave
|
|
|
|
Post by street16 on Oct 25, 2013 14:20:18 GMT -6
I don't think it's anything in the distributer, because WHEN IT RUNS, it runs perfectly - even after it starts cutting out. I don't run a fuel pressure gauge, but I will probably put one in. I'll check the fuel cell. I'm starting to think that it may be low fuel volume (blocked/kinked line, bad fuel pump) causing it to run out of gas after five laps. I've already replaced the fuel filter, I have a spare fuel pump, and replacing the fuel lines is easy to do.
|
|
|
|
Post by Krooser on Nov 16, 2013 22:34:31 GMT -6
Bad fuel line, plugged filter, bad coil, shorted wire in the dizzy...
|
|
|
|
Post by Krooser on Dec 3, 2013 1:55:23 GMT -6
try grounding the dizzy…
|
|
|
|
Post by milkman on Dec 7, 2013 19:52:16 GMT -6
I had a similar issue, my fuel pump was loosing pressure randomly, I would without a doubt put a fuel pressure gauge in it so you can make sure it is staying where it should be. Not sure if you have, but also check your float levels, to me it sounds like its running out of fuel. I have also seen where some AN fittings will get a little bunged up and suck air in, they didn't leak fuel, but were sucking air in.
|
|
|
|
Post by street16 on Dec 16, 2013 13:50:29 GMT -6
I appreciate the replies. I've got the truck torn down to replace the frame (it was that kind of year), so I won't get a chance to test the new fuel pump and lines for a while. Thanks again!
|
|
|
|
Post by motorman on Feb 15, 2014 12:28:10 GMT -6
make sure the fuel cell vent is not restricted as you need air in to get fuel out
|
|
|
|
Post by flipflopoo1oo on Feb 23, 2014 11:41:36 GMT -6
At what position on the track does this happen? I have had loose wires at switches and yes even a toggle switch to do this but the top of the fuel pick-up is usually the culprit or the bottom not being angle cut or too long of not weighted if using a hose inside the tank!
|
|
|
|
Post by street16 on Apr 10, 2014 12:01:16 GMT -6
After replacing all the fuel line from the carb to the fuel cell, it turned out to be the pick up line in the fuel cell. The hard outer coating had come off of about 4 inches of it and it was sucking shut. It's always the last thing you think of - LOL.
|
|
|
|
Post by flipflopoo1oo on Apr 10, 2014 19:08:52 GMT -6
Its the first with us now as countless fuel problems has led us to even find a red rag mid-season and we never use them as well as paint thinner added that caused a miss on new plugs after 8 laps! Some people hate loosing or others winning too often!
|
|
