Fuel Pump Help

[hdrider]

i have a 1982 GMC 1/2 ton 5.0L...i had to replace the fuel tank and sending unit on this truck because it was shot due to rust...i also replaced the fuel pump...i cant get gas to the pump from the tank...i primed the fule line from the carb but once that gas is pumped out, thats it...seems like its vapor locked...how can i get the fuel to feed up to the pump from the tank...i cranked the hell outta it & it would start to feed then stop, cant get a good flow...thanks

[gchemist]

The pump rod is probably not hitting the pump lever. Remove the pump. Use lithium or rebuild grease to hold the pump rod into the block. Install the new pump carefully. Crank it over. Fuel should come out the supply line to the carb.

[hdrider]

thanks for the reply...dont think thats the prob because i replaced the tank after the pump & it was pumping from the old tank fine & thats when i noticed all the crud in the gas, droped the tank & seen it was too far gone & i replaced it & the sending unit.

[Primer70]

I had a 76 GMC that the rubber fuel lines were coming apart from the inside & plugging up the fuel line. I'd replace all the rubber lines & blow compressed air though the steel lines to be sure they are not blocked.

[hdrider]

thanks...blowing compressed air back to the tank is my next move...the truck sat for a long time & now im having these problems getting it going again...what if it blows back fine & gas still isnt comming to the pump???...thanks

[old Rusty C10]

im going to go along with the others and say its prolly more of a blockage than anything else... have you checked the fuel filter in the carb too?

[Prong]

Maybe you accidently swapped the lines on the sender (the feed and vapor lines).

[hdrider]

running a holly carb & external fuel filter...have line disconnected befor filter when i crank it to check for flow...lines arnt crossed, 3 different size lines, i checked that...thanks

[Damien]

Somewhere recently I read about some one having this problem and it turned out to be a big glob of solder plugging up the sender.

[hdrider]

nope...i blew in every line on sending unit befor i put it in but thanks

[WRKTRUK]

Had it happen to me, what was wrong for me was when I finally managed to get the tank back in it's location I didn't realize I had folded the feed line on top of itself, well pulled the bed off this time and could just get to it to straighten it back out. I dunno if that's what's going on with yours or not, but mine did the exact same thing until I finally started back tracking and realized that the rubber line had a nice 90* bend right up against the cab of the truck.