79 K20 SBC 350 won't idle???

[Got Smoke?]

I'll try and make a long story short. My 79 gets started/ran once a week/cpl weeks to make sure it stays charged/running etc.

So two weeks ago I start the truck up take it for a lil ride down the back roads for a couple of minutes and all is well runs great.

Fast forward two weeks, my cousin gets to my house before me one afternoon and we're going to be dropping the tank to test/replace the sending unit because the gas gauge quit working. He moves the truck for me and says that it WOULD NOT idle at all. We push the truck in the basement with his and yank the tank. Test S/U its bad...so I order a replacement we reinstall tank next weekend. Truck has 1/2 tank of gasoline in it so plenty of gas.

Get tank back in and cousin is correct truck WILL NOT idle period. We pulled the inline fuel filter its not stopped up, stuck the feed side filter in 32oz gatorade bottle cranked over for a few seconds and it filled bottle half full of gas, unhooked rubber hose from SU and blew compressed air from the fuel pump feed line back so its not clogged.

If you crank it 5 or 6 times ONE of those times it might run 30 secs then die, if you keep pressure on the throttle it will run but you must constantly give it throttle? I'm puzzled? I think its fuel related because it will rev as high as I want it to if I give it throttle, but it just simply WILL NOT idle period! Help me out guys its warming up, and the truck finally has current tags again I want to start driving it again!


350, Edelbrock 1406 carb, auto zone oem style fuel pump, hei distributor. to give you a few details.

 

[BIOHZDK5]

Could be vacume lines or maybe air leak on the carb gasket. Reason I say that, I had a 74 K5 that would do the same but if you held the throtle would run fine. Come to find out the gasket between the carb and the intake, part of it was missing back on the secondaries. New gasket and ran like a champ.

 

[Got Smoke?]

Could be vacume lines or maybe air leak on the carb gasket. Reason I say that, I had a 74 K5 that would do the same but if you held the throtle would run fine. Come to find out the gasket between the carb and the intake, part of it was missing back on the secondaries. New gasket and ran like a champ.

I did notice the other day that the gasket between the carb & adapter (spread bore manifold square bore carb) was wet after attempting to get it running? That could have been from pumping the gas pedal to reprime it from sitting tho right?