Originally posted by vara4
Matt167, Sounds like the same problem I had with my ranchero.
I thought It was vapor locking when it was really a venting problem. The car ran fine at 30 to 45 MPH but If I went faster then that the car would die. It was creating a vacuum in the tank. Ends up the vent tube was pluged up. I had tried to leave the cap off the tank But the fill tubes {ONE HOSE IN ANOTHER HOSE}where collasped on each other. I guess they would'nt let the air in to the tank. I had Replaced the fuel pump, all the filters which there was three and thats not counting the filter in the carb. All the fuel line from the metal tube on the frame to the fuel pump then to the carb. The filters did make me think that the last owner was trying to fix a problem too. Hope this helps you, dont know if you have the same problem or not.

~ Vegas ~
Huh, when we drove the car down to my grandparents, it was running fine at 30 MPH, when we opened it up to achive 50 MPH, it did it for a while but we backed off the throttle cause we diddn't want to have a blow out ( badly weather checked rear tires ) and then the car started to die, we had to pull the choke all the way out to keep it running, pulled the fuel filter off, blew it out and there was stuff plugging it, ran fine after. We have not had any sediment problems since and we haven't ran it past 40 MPH since ither, that makes me wonder if a clogged filter was the problem, when we pull the filter off there is always preassure behind it. Is it safe if I blow the vent out with air hose blow gun cause it's right inside the filler neck?