This is just for your information, in-case you have ever wondered what was inside your filler neck.

What you are looking at is the Anti-Rollover valve.

The purpose of the valve it to keep the fuel inside your tank in the event of your truck rolling over.

Looking at it here would be if the truck was upside down, the green ball would roll up against the seat of the valve and prevent the fuel from spilling back out the neck.

Are you are wondering why there is an air fitting in the filler neck?

The previous owner had a 100-gallon transfer tank in the bed and only he know why he did what he did, I guess because he had one.

I am going to remove it and using my wire feed patch the hole.



Here it is in its operating position with all of your wheels on the ground, see the ball has now rolled off its seat allowing the fuel to flow past it and into the tank.



This device also acts a very effective anti-theft device, now you can rest and know there is no way anyone is going to stick a hose down your filler neck and siphon away your precious fuel.

This should also prevent anyone from "dipping your tank" without you knowing.

File this as: Maybe Useful Information

Just thought that you might be interested.

Jim

 

They can still dip your tank, I have no idea how, but they did it on my 2nd gen with no issue, been dipped twice.

 

A second Gen has got to be an entirely different animal from the pure mechanical 1st Gen.

You might be able to get past it with a small 1/8" tube.

Jim

 

The filler is basically the same, has a ball like that inside the filler. I took it apart when I had my bed off.

Also the tube is really small they use, I would say less then a 1/8th inch maybe, I have no idea how it works. Both times they had a choke point due a road being closed, they had a spotter out front and then a guy just stepped out in front on my when I took a turn at the stop light. Told me basically it was 1000 bucks if I refused to be dipped, and told me to stay in the truck. He dipped the tank with a plastic device, showed it to me, and gave me a packet of info and said I was free to go.

 

That is going to have me doing some work and installing a cone of something like HD, SS window screen in there. Dam revinoor's...
cheers,
Douglas

 

I'm confused. they stole your fuel and gave you a packet of information?

 

Speaking of stealing fuel...


It appears that "locking gas caps" are not very effective.


They reach under your wheel well and cut your filler hose... Ok...


Better yet, they take a drill and puncture your tank.



On today's newscast..
http://www.newsworks.org/index.php/t...ks-in-vineland

I'm sure they're doing it near you....



********






T.

 

I would much rather them dip my tank then puncture it.....

 

Mine had that but now it is gone. I could not pump diesel faster than a trickle with it in there.

 

I found this when I dropped my tank and redid my fuel system. I didn't know it was a rollover device, I just thought it was an "anti-siphon" device cuz I tried to stick my garden hose down there to suck the fuel out and no luck it would hit somethin ha ha. It was nice to know about it though. I drilled a small hole in top of the sending unit (there is a fitting for it already it just needs to be punched out) and put a 3/8 hose on it up through a hole in the tank to run my auxillary fuel tank in it when I get it.

 

Not to steal the thread, but I failed a California "emissions test" because the "reducer" in the neck of the fuel filler was missing, (a gasser) and I would be able to put "leaded" fuel into my vehicle. I laughingly said " leaded fuel has not even been ava, for 20 years!" Thier reply was " It has to be in there" Stoopid!!!! (YES, 2 "O'S"!)
Whatever. Nevada, here I come!

 

When Jim referred to dipping he was talking bout stealing, when Purplezr2 referred to dipping he was talking about D.O.T. checking your tank for offroad fuel.

 

We had the reducers in our early 80's models but still ran leaded gas on occasion. OR whatever they had added to the gas so we could run it in the old tractors. We just slid an old milker inflation over the end of the nozzle.

 

How to theft proof your fuel tank.

So it appears what is happening is if a thin tube were inserted into the filler neck (to siphon you fuel) when it hits the ball it will deflect it to the side and allow it to pass through the space between the ball and the inside of the neck and on into the tank, good-by fuel.

Here is a real simple way to keep anything from being inserted down the filler neck and into the tank except for anything liquid.

I am not sure of the diameter of the neck but lets say 2" O.D. all you need to do is tack weld (braze) a 2"X 1 1/2" electrical conduit reducing washer to the lower end of the filler neck.



Are you getting the idea yet?



With the washer secured to the end of the filer neck liquid can freely pass past the ball and into the tank, but if anyone were to insert a thin rigid tube into the neck and past the ball to reach the fuel it would be stopped by the washer.

This security upgrade will cost less than $2.00 and could keep thieves from stealing your fuel.

Also there was mention thieves were cutting the rubber hose that connects the neck to the tank.

Simple fix:

Replace the section of hose using marine Wet Exhaust hose.
It is wire reinforced.

This is what I used to use on my gas tanks.

http://www.gates.com/brochure.cfm?br...cation_id=5249

Jim

 

The original comment was about the DOT using a thin tube to dip the tank.

I really cannot imagine a thief using anything that thin to steal fuel. It would take forever to siphon a tank that way. They will just drill a hole in the bottom of your tank & catch the fuel as it drains out. As for the DOT, won't they just pull your filter to get a sample if they can't do it the easy way??

I don't know about you guys, but, if they are going to steal, i'd rather they just siphon it than have them ruin my tank. (I prefer they not steal at all)

It would be good for a laugh to see how the thief's gas car runs on diesel though . . . . . almost worth the lost fuel if i could see it.