DaveyDaveDaveDave Posted July 29, 2012 Report Share Posted July 29, 2012 Just put on a new (to me) junkyard carb and blocked off the EGR and what nots on a 77 l20. The carb came off another truck, is externally identical and initially ran great. That lasted a week. Under load it cuts out and dies. Im Guessing vacuum, somewhere in my previously used gaskets and hand made block off plate. I had it idling for a minute and no poking or prodding around the plate changed any thing, and the carb is bolted tight still. Anything stupid/basic/obvious I might be missing before I tear this thing off at work? Edit: Getting fuel to the carb (new filter and pump 3 mos ago) EI dizzy, still fires Quote Link to comment
datzenmike Posted July 29, 2012 Report Share Posted July 29, 2012 If it idles it won't be a vacuum leak. While idling check the fuel level in the sight glass on the front. If low or not showing the float may be set wrong. Take it for a hard run. When it dies get the clutch in (or shift to neutral) and the key off as fast as you can. You want the engine stopped ASAP to preserve the condition of the carb when this happens. Do this on an empty road. Roll to a stop and check the sight glass on the front of the carb. If full to the line, it's not a fuel delivery problem. Could be a partially blocked jet... If empty, or very low, you do have a delivery problem.... Float set too high and not keeping enough fuel in carb and it runs out under load. There is a brass screen just above the float where the gas line connects to the carb... it could be blocked with crud restricting flow. The pump could be faulty or the fuel filter now clogged. Quote Link to comment
DaveyDaveDaveDave Posted July 29, 2012 Author Report Share Posted July 29, 2012 Checked the float, all good. Turned out to be a jet issue. Jet is back in. Test drive in t-minus 20 min. Quote Link to comment
ggzilla Posted July 30, 2012 Report Share Posted July 30, 2012 The jet came out? Or was loose? Quote Link to comment
datzenmike Posted July 31, 2012 Report Share Posted July 31, 2012 The jet came out? Or was loose? This. 1 Quote Link to comment
BigBlack620 Posted April 24, 2013 Report Share Posted April 24, 2013 What ever happened with your ride? Quote Link to comment
DaveyDaveDaveDave Posted April 26, 2013 Author Report Share Posted April 26, 2013 The jet worked its way completely out. Got lucky though. Stuck in the venturi, rather than making it down to the intake or worse. Just pulled the top plate off the carb, put the jet back in. Been driving it daily for over a year since. Quote Link to comment
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