800 with leak in fuel shut off, 4000 series any better

I have a ford 800 that is leaking at the fuel shut off under the tank. The fuel shut off is the type with the screw (to shut fuel off). Are the newer fuel shut offs from a 4000 series with a lever any better and if so will this be direct fit?

After reading some previous post this fuel shut off seams to be a common problem and someone mentioned its a 40 min process? It seems like a ten minute swap? Am I missing something? besides draining tank its only two screws and a line.
 
Both the screw type and lever type fuel valves are known to be leak prone. The lever type valves are also known to fail to completely shut off.

The valves are interchangeable provided you have the compatible fuel line and sediment bulb.

Dean
 
It"s a 10 minute job if the fuel tank is off the tractor. It"s more like a 2 hour job if the tank is still in place. Wait until you try to get the fuel line disconnected and the 2 screws removed and reinstalled with about 2" of room between the bottom of the tank and top of the rocker cover.
 
ditto what the others said.

if you got the line size and bulb correct ( small / large ) carb, etc.

any you can take it off.. but wait till you are near outta fuel... smaller hands help.. so does a flair wrench.. take line off at carb / fuel bowl to give it some play..
 
You can change it without removing the sheet metal and tank.

I've got it down to about 30 minutes but I have had lots of practice and do have the correct tools.

The first time was closer to 2 hours.

Dean
 
I had a leaky shut-off valve and bought a replacement that was leaky out of the package. So I returned it, and the replacement was leaky too. They're not made well these days. So I used a plastic shut-off valve from a lawn mower---spliced into the fuel line. No leaks, but you'll need smaller hands to open and close in the tight space under the tank...
 
Here is what I did...
No more reaching up above a hot engine and risking burning myself. Also, no more dealing with a leaky shut-off valve.

Brake line, some compression fittings...easy peasy (after you remove the tank).

Also, only a half turn to shut off fuel ;-)
a123562.jpg
 
Assuming the leak is internal in the valve, you can use the old valve and just leave it in place---open all the time. If the leak is around the valve and dripping down from there, that's usually solvable with a new o-ring between the tank and valve.
 
(quoted from post at 10:04:41 07/29/13) It"s a 10 minute job if the fuel tank is off the tractor. It"s more like a 2 hour job if the tank is still in place. Wait until you try to get the fuel line disconnected and the 2 screws removed and reinstalled with about 2" of room between the bottom of the tank and top of the rocker cover.

Not to mention the muffler right along side.
 
For me, I had a leaking o-ring where the valve meets the tank. I replaced the o-ring and stopped the leak. I used brake line to re-route a new fuel line. Then added the inline ball valve for a shutoff. This way, I just reach down and turn the lever without getting near anything that can burn me.
 
Leave the valve on the tank.Put a new o ring on the screw. never open the valve more than 2 turns.I can plow and bale hay on 2 turns open.Opening it more just wears the o ring.These valves were made by Bendix, originals will be marked so.I have found that MMO will swell original o rings . A few ounces in the gas will do it.
 
can't simply add an elbow.. the tap screws tot he tank with 2 screws and has an oring seal there.. plus a seal in the valve.

pretty easy to rebuild.

IF you were to eliminate the valve.. i would probably disassemble it and tin the brass valve and the zinc valve body and then solder them up so the valve was open.. i know some people have reported doing so with a jbweld plug as well.

IMHO.. it's more work to jimmy it than just take apart and repalce 2 orings...

ps. oring wear occurs from valve opening and closing.

you could take apart.. repalce orings.. then leave valve open and then put an inline common ball valve in that was easier to work on .. or more durable.. etc..

your call
 

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