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9650STS pressurised fuel tank

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374 views 5 replies 2 participants last post by  tp  
C
#1 ·
There is a pair of strange brass fittings on the engine intake manifold. A hose connects to them, that I am sure runs to the fuel tank. I can't see a breather on the fuel tank. So I presume that it uses turbo boost pressure to pressurise the fuel tank.

The two fittings have a piece of felt between them. One fitting has a tiny orifice. It also has a vent hole, on the fuel tank side of the orifice.

It's not something I've ever seen before on anything. It seemed like an okay idea because no blocked breathers and no need for a lift pump. But with a vent hole that goes external, it just seems weird.

But anyway, I'm stuck with it and I need new fittings because the thread is damaged. Unfortunately, I can't find it anywhere on the online John Deere system.

Has anyone seen this before?

Can anyone help me find it on the parts diagrams?
 
T
#3 ·
Thought that setup was kind of interesting too. Deere must have decided it wasn’t the greatest idea cause they have a kit to change it to a regular breather and plug that off. Ah215771. $200 of course for something simple. Don’t know about original fittings like you have if they are still available
 
C
#4 ·
Where it shows either item 5 (sensor) or item 10 (plug) should fit into the intake manifold, is where the fitting goes.

The picture us obviously not correct, because it seems my manifold has tapered pipe thread, but the sensor or plug have parallel thread and o-ring seal. Plus, no indication of the reducer fitting or the brass fittings for the hose to the fuel tank.



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