puzzled on no start

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kentrx1

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kent
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1986
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c10
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305
1986 truck all original 305 engine and carb. purchased a rebuilt carb and put on engine about a year ago and cranked and ran fine. let it sit about 6 months and got no start---unless i poured gas in carb. took carb off and found rebuilder did not put spring/clip on float so i put one on it and reinstalled. engine started, was a little flooded, but cleared up quickly and ran fine. next day started fine. let it sit a week and now no start-----won't start even by pouring gas in carb. it does show to have spark....really puzzled now!!
 

Snoots

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Pump seal likely shot due to ethanol.
 

fast 99

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Badly fouled plugs will cause a no start especially in cold weather.
 

85K304SPD

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Old gas, carburetor "jelly", fouled plugs, corroded terminals on cap. Start with the basics.
 

kentrx1

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Have checked those things out. Most puzzled as it won’t run, at least for a few seconds, when pour gas in carb Using spark tester shows plugs firing. Was running fine a week ago.
 

Ricko1966

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Leaving the clip off isn't a problem it is actually a common trick to prevent a different problem. Pull some spark plugs and look at them. Clamp an old spark plug in a jumper cable,open the gap up to about .090 ground the other end of the jumper cable,attach a plug wire and crank see if you have spark, remember open the gap way up a healthy coil will jump at least .090
 

Matt69olds

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Verify it has spark before doing anything else.

Next, carefully pour some fuel into the vent tube. Wedge a screwdriver in the choke flap to hold it open, look down into the carb while you pump the throttle. You should see a solid stream of fuel out the accelerator nozzles. If not, it’s pretty clear either the carb wasn’t rebuilt correctly, or it wasn’t rebuilt with ethanol compatible parts.
 

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