The only thing i know about the P.D when it fails is that a "screw" loosens up and starts to back out and fuel begins to leak out. Why cant it be screwed back in? Or solder a dime over the opening to keep the screw/fuel from coming out? I dont fully understand how the P.D works and what preventive fire measures work. It seems logical that if this screw backs out, just put something over the opening to keep it in there.

 

No, the screw's position affects how it works, and you don't know where the position is. Apart from removing it (since the anti-PD guys will no doubt be in here soon...), the best way to eliminate the chance of an old PD leaking is to just get a new one. It'll be good for at least 15 years...

 

Banjo bolts own, mines blue for better fuel flow.

 

you could always get the s5 ones...they were made of metal correct?

 

No, the S5 ones leak too.

 

My FD's FPD is smelling of fuel as well as my FC.

 

I never understood why people did not just put thick plastic bags over them with RTV black around the seal and a zip tie around the outside.

Or hey, if you're really paranoid, fill the bag entirely with RTV.

 

The S5/S6/S7 design is not sealed either, so if the little rubber tab breaks off, then the PD will act just like a S4 one that the screw fell out of.

The screw (or rubber tab on the S5 and FD) prevents the PD diaphram from moving too much. If the screw length is too short the PD doesn't move enough to work, and if it is too long moves too much (much like no screw at all) the diaphram rips and leaks.

 

The screw is being misunderstood. The screw can fall out on the ground and the PD will not leak thru the PD screw hole. What WILL cause it to leak is the DIAPHRAM being ripped and torn.

If the screw has fallen out and you crank it back in with torque, you WILL tear/rip/ruin the diaphram and then it will leak.

If the screw has fallen out and you have recovered it, get some Vibratite or Locktite and gingerly screw the screw in a clockwise direction til minimal resistance is felt. Stop there. Reinstall the plastic cover and go on your merry way.

I posted pictures of a disassymbled PD some time ago if you want to see how it goes together. You can search for it. I won't.

I did not read past the second or third post on this thread and have no idea what the other posts read.