Awl --
Thanks to Bob Haller -- and other input, of course -- I found a dert simple way to do this, with no ill effects to the car's pyooter or anything else.
Rather than fool with the pressurized supply line (the shrader valve bob spoke of), I found the *return line* to the gas tank, and used that line. You can distinguish the two by squeezing either with a pliers -- the supply line (to the engine) will shut down the engine in very short order, while the return line back to the tank does not. In fact, squeezing the return line speeds the engine up slightly, which makes sense.
Now, in this scenario (running the engine), you wouldn't want to use the supply line to the engine, bec you could easily starve the engine of fuel in this transfer process, whereas the return line to the tank does not affect the engine one whit. However, if you are careful, you might have better results from the pressurized supply line, being watchful of the engine idle. I opted for the "safer" return line.
So I cut the return line (the short section that is rubber), turned on the engine, and lo and behold, boucou fuel -- on the order of a quart in about
20 secs. For the benefit of the Butt Bros George and JoeBlow, dats 3 qts per min, 3/4 gal/min, or about 45 gals/hr -- not too bad. I hope the Butt Bros were able to follow that.....Now, the other scenario is, if you are able to jump the fuel pump (which seems to operate off a relay), then you can tap into either line, cuz you don't need to turn the engine on. You may get a higher flow rate by using the supply line with the engine off. And some cars may start the fuel pump just with the ignition on, which would be nice for this.
So after filling a qt, I hose-clamped the tube together with a barbed coupling, until I can put in a T + ball valve. This hose is hose-clamped at either end to metal tubing anyway, no fancy fittings like on the pressureized supply. If I can jump the fuel pump relay, I might fool around with the pressurized side, but the fittings on the end are pretty substantial, so the hose may not be amenable to simple hose-clamping -- altho both the supply and return hoses appear to be the same type of hose.
So this is a really elegant solution to transfering gas, at least from the truck to some other vessel. I'll figger out a way to nicely transfer stored gas to the truck, and it seems like a submersible automotive fuel pump would be a safe way to go, altho manual pumps are certainly viable.
If this works out, I may bump up my li'l doomsday storage depot to mebbe
1,000 gals..... The Butt Bros on Doomsday: Please, Sir, may I have more gas from your return line?????