1lo620 Posted July 20, 2012 Report Share Posted July 20, 2012 Ok, if I dont drive my truck regularly and let it sit for more that 2 or 3 days, it wont start without me priming the carb. It is a L18 with a weber 32/36, stock exhaust manifold, offenhauser intake nothing fancy... I dont get it..what a missing? Quote Link to comment
wayno Posted July 20, 2012 Report Share Posted July 20, 2012 What kind of fuel filter you have? I had a glass bowl type filter on my NL320, it kinda/sorta had a leak, so when the truck sat for a few days, the fuel would drain back into the tank, and since it had a leak, when the pump tried pumping the fuel from the tank, it would just suck air threw the leak, I put a plastic fuel filter in place of the glass one, never had issues since. The leak was before the fuel pump, so there was no pressure in that line, so fuel didn't squirt out of the leak, it just let the gas go back into the tank when the engine was not running. Quote Link to comment
1lo620 Posted July 20, 2012 Author Report Share Posted July 20, 2012 Stock fuel pump and fram plastic fuel filter, ones I have always ran on my trucks... There is usually fuel in the filter, just cant get it to fire up.. drop a little fuel in the carb... fires right up...I dont know.... Quote Link to comment
Pacific coast Datsun Posted July 20, 2012 Report Share Posted July 20, 2012 Dave..my 620 used to do the same thing. I replaced the accelerator pump on the carb & problem solved. The part cost $12 @ a local VW shop. Quote Link to comment
banzai510(hainz) Posted July 20, 2012 Report Share Posted July 20, 2012 3 days I have to pump the shit out of my 521. otherwise no big deal. Quote Link to comment
DISLEXICDIME Posted July 20, 2012 Report Share Posted July 20, 2012 My dime did this a long time a go. Changed the fuel pump problem solved. Quote Link to comment
Dawa Posted July 20, 2012 Report Share Posted July 20, 2012 'fuel issue' immediately popped into my mind as well. when you try to start it, the motor turns over but just dont 'fire up,' correct? that would eliminate a starter issue for sure. Quote Link to comment
datsunaholic Posted July 20, 2012 Report Share Posted July 20, 2012 Webers for some reason (probably the open float bowl design) evaporate fuel really badly. Couple days, the float bowl is dry. With a mechanical fuel pump, it takes forever to get fuel back up there and into the bowl. Especially cold cranking, since the pump isn't producing much volume. With the engine RUNNING it's pumping really well. So priming it gets the engine running fast enough to get good volume from the pump. I rarely had that issue with my trucks that have electric pumps, but often have that issue on ones with mechanical pumps. Quote Link to comment
Dawa Posted July 21, 2012 Report Share Posted July 21, 2012 ^ ahh. now that youve said it, it seems so obvious! of course the fuel would evaporate in an environment such as the weber's bowl. ive been wondering why it takes more than an instant for me to start my car up! :) Quote Link to comment
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