Would an anti siphon valve on the fuel tank help?
 

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.

Re: Would an anti siphon valve on the fuel tank help?
 

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.

Re: Would an anti siphon valve on the fuel tank help?
 

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. :mm:

Re: Would an anti siphon valve on the fuel tank help?
 

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.

Re: Would an anti siphon valve on the fuel tank help?
 

You have a hidden switch wired to this?

Re: Would an anti siphon valve on the fuel tank help?
 

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.


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Re: Would an anti siphon valve on the fuel tank help?
 

No just to the ignition on the fuse panel .

Re: Would an anti siphon valve on the fuel tank help?
 

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