I bought the 72 grabber back in june and it has set up for a couple of yrs,i had to clean the gas tank out cause it had rust,i bought a kit to clean it and used the bill hirstle sealer kit.i went ahead and replaced the mechanical fuel pump,filter and all rubber lines.When I was done I put 5 gallons of gas in the tank .had to prime th ecarb with a few trickles of gas and waalaa it fired up .it ran but the clear view filter didn't seem to show a full flow of gas going threw the line but was enough to keep th ecar running even when I would rev it up it didi fine. Well every time now when I go out to start it I have to re prime the carb to get fuel coming in to the carb and threw the lines,i though tmaybe the system had air so I unhooked the rubbe rline going into the carb and ran it in a jug but it didn't get any better any suggestions whats wrong?
the pump is new ! an dyes I have replaced the rubber line under the driver floorboard.i replaced everything except the metal lines
I had this issue awhile back and it was the fuel pump. Now I still have to crank mine a couple of turns to prime the carb if the car has set for a couple of weeks. Mine has a Carter RBS carb, which is susceptible to evaporating the gas out of the float bowl when I shut off the engine. It is very hot right in the area of the carb, so you should have an aluminum heat shield under your carb. It was factory on some models and it helps keep the fuel bowl cooler. I installed a small electric fuel pump right where the fuel sender line comes from the tank. If my car has sat for a few weeks, I'll just turn it on for 30secs and it will pump right through my mechanical pump and prime the carb! They're around $50 at any auto parts store! It eliminates cranking to prime the carb! Edit: I now notice where you replaced your pump. I would very carefully check all your steel lines for any corrosion, especially where they have mounting clips and anywhere they touch the floor. Even a small hole anywhere will let air in and not pull fuel! It may not leak fuel at all, either! You can test for an air leak by disconnecting your fuel line at the carb, obtain a clear vinyl hose to connect to the removed fuel line, and either by sucking on it or using a hand vacuum pump, pull fuel up into the clear hose where you can see it, then pinch off the hose with pliers and see if the fuel creeps back to the tank. It should stay there! I also had a Ford truck that had rusted a hole in the fuel sender inside the tank! This one would not even pull fuel up at all, but if your lines check out, that would be about the only other place you could have a leak!
I found the problem I had a clamp to far away from the fuel filter,i loosened it and moved it up some when I did this my problem has fixed itself thanks for all your help guys ,by th eway I run a 600 edelbrock carb which is running rich I have been playing with the idle mixtures but doesn't help.i may take it down and give it a good cleaning might be gummed up or trash from the prevuious dirty lines
Glad you found the problem! Even the smallest air leak will mess you up! As far as your carb goes (I have a 250, I now see you have a V8), you'll do well to disassemble and clean it. You may need to get a kit, but those are fairly simple carbs and I'm reasonably sure it's just gummed up from sitting. If you used alcohol gas, I'll guarantee it's gummed up from sitting that long!
