Lots of good recommendations, I’m going to get to this on Wednesday and I’ll post up what I find. Thanks to everyone that that replied to this question, I’m always impressed by the mud folks. I’ll be really angry if it’s the tank though, it will be a real pita to pull that and try and get some...
Hmm, I need one of those. I thought the vented fuel caps let air in but not out? Did you drill it? I think you are right about the source of the pressure, I just can’t figure out why it won’t vent through the separator. I don’t imagine the repeated oilcanning is good for the tank seams...
Not negative, it’s positive pressure - I can actually see the tank relax and feel the breeze when the cap is removed, it is pretty loud. Only other tank connections are the fuel filler, filler vent, fuel supply (to carb) and return to tank.
If it’s hot out the pressure builds without running...
Nothing is down stream of the valve, just vents to atm until the CC is hooked up. I just don’t understand why the pressure is not venting out this route. Especially since I can suck fuel vapor so easily through it.
1975 fj40, new gas tank and lines, stock fuel separator, in-line stock check valve off of separator (works as one way valve) in correct orientation, desmoged but p/o eliminated charcoal canister, bvsv and vsv. Stock carb.
When run even for a short period of time there is substantial positive...