510_dreamin Posted May 30, 2020 Report Share Posted May 30, 2020 My 510 had been running great recently until this week it developed an issue where when I start it it dies unless I keep the revs up. It went from idling then slowly dying and now it won’t idle at all unless I keep my foot on the gas. I changed out the fuel filter tonight as the old one was accumulating a good amount of gas in it, 3/4 or more full, whereas before, it was maybe 1/4 of the way full. Any ideas what it could be? Maybe a bad fuel pump? Currently running an L20 with dual Webers Quote Link to comment
banzai510(hainz) Posted May 30, 2020 Report Share Posted May 30, 2020 (edited) If it runs when revs how could it be the fuel pump?????? Im not a DCOE expert but I would open the top and click the jet blocks and actually see if they screwed in tight the fuel filter is a misnomer. Don’t go by how full it is.open the old one up and see how much dirt is on there.510s tanks are pretty clean as it’s in the trunk and maybe some rust.trucks have more issues as it’s a exposed tank and fuel line in wheel well. I don’t know how long you owned this or wrench on this but a would Cheack the valve lash if you haven’t checked it or make sure the intake and carb bolts are snug Edited May 30, 2020 by banzai510(hainz) Quote Link to comment
datzenmike Posted May 30, 2020 Report Share Posted May 30, 2020 Sudden unexplained failure to idle is almost always (for me) a vacuum line fell off. Carburetors on tight? Intake tight? Automatic???? Did/do you have a brake booster? Quote Link to comment
510_dreamin Posted May 31, 2020 Author Report Share Posted May 31, 2020 No brake booster. It’s a manual. I changed out the plugs and wires yesterday (hoping it was something simple) and it idled better...would stay on maybe 15 seconds before dying, but stays on as long as my right foot is the cold start. Once it gets up to temp it won’t rev past 3k rpm and dies without me giving it revs. Thankfully it’s not smoking or anything. Is there a guide anywhere of how I check the carbs or vacuum lines. I’m not too familiar with either but definitely open to learning Quote Link to comment
banzai510(hainz) Posted May 31, 2020 Report Share Posted May 31, 2020 You check the jet blocks? otherwise you might as well change the rear tail light bulb. start at carb first then work back to intake, valve lash distributor timing, vacuum line? How many is there beside maybe a brake booster or to the distributor. im not a DCOE expert but maybe pull out the jet block as a pc of dirt could clog it up if your fuel filter was really bad if you cut it open Quote Link to comment
510_dreamin Posted May 31, 2020 Author Report Share Posted May 31, 2020 If I knew how to check the jet blocks I would. Any insight on how to? Quote Link to comment
banzai510(hainz) Posted June 1, 2020 Report Share Posted June 1, 2020 On top of carb should be a screw or butterfly on webers that holds a cover and then one can see the jet tubes inside. only thing I can’t figure out if one block is plugged I think it should still run on 3 other cylinders so I’m at a loss. i had a inner Venturi go loose but I lost top end power. My jet block works loose every now and then also but I still have idle Quote Link to comment
510_dreamin Posted June 1, 2020 Author Report Share Posted June 1, 2020 Thanks! Quote Link to comment
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