Fuel pressure sensor leak

[KyFarm]

Put a HT383 in my 69 K10 and after running a bit installed a ProFlo4 on it. After driving a bit I’ve developed at small drip fuel leak from the threads of the fuel pressure sensor, tried to tighten the sensor and that didn’t fix it. Removed the sensor and checked threads on sensor and fitting, all look good.

the sensor isn’t built like it should take a bunch of torque and doesn’t have an o-ring.

It’s an edelbrock 3546 sensor with 1/8 -27 npt threads.

Does anyone know of a trick to get this sealed?

Tighten it until it seals or cracks? This seems like a good way to develop a crack later and burn your truck down.

Thanks for any help.

[Willshook]

NPT needs sealant; it won’t fully seal dry.

[KyFarm]

Originally Posted by Willshook

NPT needs sealant; it won’t fully seal dry.

Can you suggest a sealant that works on fuel lines?

[Willshook]

This is my go-to:

https://www.permatex.com/products/ga...-liquid-16-oz/

It’s fuel-safe; the key is not to apply it a bit higher on the thread and not on the tip of the fitting.

[Dead Parrot]

2nd on the need for sealant. Plumbers use sealant on nat gas NPT threaded plumbing and that is less then 1psi for most residential uses.

[KyFarm]

Originally Posted by Willshook

This is my go-to:

https://www.permatex.com/products/ga...-liquid-16-oz/

It’s fuel-safe; the key is not to apply it a bit higher on the thread and not on the tip of the fitting.

above you say NOT higher on the thread and NOT on the tip of the fitting.

I've always applies sealants higher on the thread and NOT on the tip, is that what you meant?

[Willshook]

Originally Posted by KyFarm

above you say NOT higher on the thread and NOT on the tip of the fitting.

I've always applies sealants higher on the thread and NOT on the tip, is that what you meant?

Bad wording on my part - "higher" to me on a fitting means closest to the hex.

You're right - bottom line is we don't want that junk in the fuel system.

[Orange Crate]

I can't see the electrical connector pins in any of the pics online so one issue to look at is if the sensor grounds through the case/body. Sealant could prevent good grounding. If the connector is two wire you don't need to be concerned as it will most likely be grounded at the FI ECU. If it is a one wire connector you might see some pressure discrepancies at the display, or calculations could be inaccurate.

[Willshook]

Typically, if it was grounded through the mechanical connection it would have NPT*F* thread, which does not require sealant.