Fuelab AFPR leaking boost

[dwb]

What's a good way to seal the adjustment screw on a Fuelab AFPR? This isn't a significant leak, but a leak nonetheless.

I found this article that mentioned it is normal, and they fixed it with loctite(!). I'd rather not use loctite...maybe a thread seal compound?

Most Adjustable Fuel Pressure Regulators Leak Small Amounts of Air

Most Adjustable Fuel Pressure Regulators leak small amounts of air. Many people don t realize this. Though this leak is not significant, and ultimately is accounted for when the vehicle is dyno-tuned, it can be helpful to be aware of this condition.

fuelab.com

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[steve]

Have you tried an o-ring or rubber washer under the nut?

 

[RamenPride]

I don't have a Fuelab, but removed the adjustment screw and used Teflon tape.

 

[pottersgst]

Yellow Teflon tape here 5 years never had a leak

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[jdxnc]

I use plumbers dope on it, you can usually adjust it a few times before it will leak again.

 

[dwb]

Have you tried an o-ring or rubber washer under the nut?

To seal it to the body? As best I can figure, it'll still leak around the inside of the nut/washer. However, that would be simple to test, since I don't have to pull the adjustment screw.

I don't have a Fuelab, but removed the adjustment screw and used Teflon tape.

I did use Teflon tape on the vacuum/boost port. I didn't really think about it on the adjustment screw. That's something I'll have to consider.

I use plumbers dope on it, you can usually adjust it a few times before it will leak again.

This is also an option I'll consider. What about Permatex thread sealer? I've got a tube of that laying around somewhere.

 

[steve]

To seal it to the body? As best I can figure, it'll still leak around the inside of the nut/washer. However, that would be simple to test, since I don't have to pull the adjustment screw.

It should fit tight to the adjustment screw shaft since it's the thread interface between the screw and the body that's leaking. Compressing either with the nut should cause it to seal there. If it's loose around the shaft it's only going to seal between the nut and body which doesn't help much.

Yellow teflon tape or the Permatex thread sealer should also do the job.

 

[jdxnc]

This is also an option I'll consider. What about Permatex thread sealer? I've got a tube of that laying around somewhere.

It's all pretty similar.

 

[MrCornfed85]

Had the same issue, called fuel lab and they said it’s rare for this to happen but when it does to use a thread sealant or teflon tape. I used teflon tape and worked