Would an anti siphon valve on the fuel tank help?

[IT Cowboy]

I am back with more paranoia about leaks but this time I think it might be a bit more justified. I park my truck inside the attached garage and am concerned about a fuel leak or the possibility of a fuel leak especially if I would be away for a few days. I am considering putting an 3/8 anti-siphon barbed and clamped valve in the fuel line where is exits the cab under the truck.

The backstory that made me think about this is that a year ago when I changed the fuel pump I left the truck sitting overnight in the drive and I left the fuel pump feed line disconnected. Longs story short I didnt cap it off or pinch it enough and it popped open during the night and drained 5 gallons of fuel on the drive. I am sure it did that from the lack of air break in the line and it created its own siphon and drained the fuel.

Now the reality is the chances of a clean break like that and not a weep or drip are very slim and especially while I am away. I could also just put a shutoff valve in there but I would need to turn it off and on each time I drive the truck

Any ideas or thoughts here. Am I being overly cautious or is there an easier and more reliable solution.

[mr48chev]

In a garage with a seat tank between 49 and 72 I am more worried about gas fumes venting out the vented gas cap than gas siphoning on a vehicle that has all the lines in good shape and hooked up right.

When I get the rear mounted tank set up right it will have a charcoal canister under the hood with proper vent lines and a non vented cap. One reason is that I just don't want to smell gas at the back of my truck when it is parked somewhere. I don't take the 71 to much of anything except cars and coffee but with the 48 I was more afraid that some clown would be too close with a lit cigarette on a hot day as you could smell the the fumes from the cap in the bed floor.

I had a 64 GMC with a manual tank switch under the drivers seat that had the holes for other tanks plugged after the seat tank had been removed, 30 gallon stainless tank in on the flatbed. I couldn't get it to stay running when I traded for it and the problem was that that valve was switched to another positon. It served as an anti theft device pretty well too.

[HO455]

If you have replaced all the hoses with the appropriate new fuel hose you are more likely to have the truck stop running when the anti-siphon valve sticks closed than to have hose break in two and drain the tank.

Just my opinion which along with a sawbuck will get you a steaming hot cup of Joe just about anywhere.

[72c20customcamper]

I use one of these in my 68 reason being I have a keg for a gas tank in the bed . The fuel comes out the bottom of it so the pressure of a full tank can siphon. It’s worked very well and if someone hot wires the truck it will run out of gas fairly quickly.

[Rust_never_sleeps]

Originally Posted by 72c20customcamper

I use one of these in my 68 reason being I have a keg for a gas tank in the bed . The fuel comes out the bottom of it so the pressure of a full tank can siphon. It’s worked very well and if someone hot wires the truck it will run out of gas fairly quickly.

You have a hidden switch wired to this?

[IT Cowboy]

I put a shut off valve just before the fuel pump with a rubber line and the rolled edge clamps. I also made a new hard fuel line and installed it. I ran it in front of the rad hose and above the intake manifold to be able to get some air and be away from the heat.

[72c20customcamper]

Originally Posted by Rust_never_sleeps

You have a hidden switch wired to this?

No just to the ignition on the fuse panel .

[geezer#99]

What did you use for a tubing bender?
Your fuel line looks a bit crimped at the bend areas.