803 fuel filler rubber gasket

[smokem joe]

Just thought I'd let the group know about a fix I found today for the fuel fill rubber that seems to be rotted on some of these. A fernco fitting, 4" cast iron to 4" copper, works perfect to replace these. Probably won't find this one in the box stores, but it can be picked up at any plumbing supply house.

 

[Triton]

How does this work

 

[smokem joe]

It looks like that only in 4". The metal band slips right off and use the hose clamps just like normal.

 

[smokem joe]

Fernco part# 3007-44

 

[Dieselmeister]

I found the Fernco 1070-44 works. You just have to trim the length somewhat. $11 at the big orange home center.

 

[smokem joe]

I didn't trim the length at all on 3007-44. At least we have alternatives to finding military stuff!

 

[Bmxenbrett]

Are you talking about the canister fuel filter? Every time i buy fuel filters they come with new gaskets. Both the spin on and canister.

OpS. Fuel FILLER.. can you take pictures of what your talking about?

 

[smokem joe]

 

[smokem joe]

I didn't use the metal band part, but the rubber on this works perfectly to connect the fuel filler neck to the tank. I've had three units that the rubber was crumbling on lately and this makes a perfect replacement in stock locally.

 

[dav5]

Is the rubber resistant to diesel?

 

[smokem joe]

Not real sure. It doesn't really get wet with diesel. It is more of a dust and dirt gasket. The filler neck fits down inside the tank so the metal on the filler neck shoots the fuel past where this rubber goes. It is certainly better than nothing, which is how I got one unit in recently.

 

[Dieselmeister]

According to the FERNCO website, the fittings are made from PVC. Their chemical resistance chart does not include Diesel, but they marked Kerosene as "not recommended". Since this coupling does not hold any pressure, I don't think it will be an issue. I cut up the leftover piece I had from my coupling, and put the pieces in a mason jar with diesel. I will report back if anything unusual happens.

 

[smokem joe]

PVC is rated excellent when checking compatibility with diesel fuel.

 

[Dieselmeister]

According to the FERNCO website, the fittings are made from PVC. Their chemical resistance chart does not include Diesel, but they marked Kerosene as "not recommended". Since this coupling does not hold any pressure, I don't think it will be an issue. I cut up the leftover piece I had from my coupling, and put the pieces in a mason jar with diesel. I will report back if anything unusual happens.

Here is an update on my Fernco diesel soak test. I placed the remnants of my Fernco coupling trimming in a jar of diesel on 18 March 2018. I just found the jar, while looking for some other items in my shop. These parts have been submerged in diesel for almost 6 month. The plastic has hardened to the same hardness of PVC pipe, but have not become brittle. I could not bend the parts by hand, but could bend them with pliers. The parts did bend with pliers, but did not break. I suspect the diesel is leaching the plasticizers out of the PVC. I will let the rest soak and will check again later to see what happens.

 

[Guyfang]

Not real sure. It doesn't really get wet with diesel. It is more of a dust and dirt gasket. The filler neck fits down inside the tank so the metal on the filler neck shoots the fuel past where this rubber goes. It is certainly better than nothing, which is how I got one unit in recently.

Got to kinda disagree here. It depends on where your gen set is. If it's planted on a concrete pad, no, it's not going to get diesel on the rubber coupling. But in the milatary, EVERYTHING, is supposed to be deployable. When a gen set is mounted on a trailer, rolling down a bad road, or trail, (this was my final test to any trailer mounted set after working on the fuel tank and attached components) will soon let you know when you have a leak. And the practice of Filling the tank till its full up to the cap, often kept this part not just wet, but soaked, for months on end. JP-8 tended to quickly make all rubber parts get brittle. The Army tends to train very often, and long. In places that are very challenging. Then comes deployments. So what I am saying is this. If your unit is trailer mounted, it might pay to install a better quality part. Pad mounted, you might get away with something of a less quality, IF you don't over fill the tank and leave it over full for months, or years(?) over full.

 

[Dieselmeister]

With the virus going around, I am finding plenty of time to work in my shop, and ran across this test I started on 18 March 2018. This is a final update of my Fernco diesel soak test. These parts have been submerged in diesel for almost 25 month. The final results are the same as in my last update . The plastic has hardened to the same hardness of PVC pipe, but has not become brittle. I could bend the parts with pliers, but they did not break.

For those that are curious about Silicone hoses, I also tested those. All references I could find state, Silicone is not compatible with Diesel. That is an automatic challenge for me, so I dropped some 3/8" reinforced Silicone hose into the jar about 2 month ago. Interesting result - the hose swelled up to 1/2" in size, but still had the same texture and feel as before. Definitely a no-go for Diesel.

Now if I could just find a substitute for the 802 radiator hoses!

 

[Guyfang]

There was a post within the last week about where to the hoses. cant remember who, what, when or how, but there was.

 

[Light in the Dark]

With the virus going around, I am finding plenty of time to work in my shop, and ran across this test I started on 18 March 2018. This is a final update of my Fernco diesel soak test. These parts have been submerged in diesel for almost 25 month. The final results are the same as in my last update . The plastic has hardened to the same hardness of PVC pipe, but has not become brittle. I could bend the parts with pliers, but they did not break.

For those that are curious about Silicone hoses, I also tested those. All references I could find state, Silicone is not compatible with Diesel. That is an automatic challenge for me, so I dropped some 3/8" reinforced Silicone hose into the jar about 2 month ago. Interesting result - the hose swelled up to 1/2" in size, but still had the same texture and feel as before. Definitely a no-go for Diesel.

Now if I could just find a substitute for the 802 radiator hoses!

I know this is an older post (bumped for the Fernco info) but hoses are available in the classifieds readily. Or at least till the batch I ran runs out, doubtful I will run again.

 

[CallMeColt]

I found a decent fix to this in my thread here;
https://www.steelsoldiers.com/threads/mep-802a-fix-up-thread-3-0.212213/post-2510220

 

[smokem joe]

I found a decent fix to this in my thread here;
https://www.steelsoldiers.com/threads/mep-802a-fix-up-thread-3-0.212213/post-2510220

Same fitting, only yours didn't come with the steel band.