Jump to content
The mkiv Supra Owners Club

Sealing FPR fuel gauge and Fuel Pressure Sensor 1/8npt


Scott

Recommended Posts

I've read horror stories in the past with regards to using PTFE tape on anything regarding your fuel. The issue, I've been warned about, is that over time the tape can degrade and end up in the fuel line, potentially blocking the fuel.

 

Is this just a horror story or is there real truth to this regarding auto fuel? I know about it due to working with jet fuel, where the issue is very real. I was just wondering if it's somewhat of a wives tale that's ventured over from the aerospace industry?

 

Anyway, I'm not happy with the seal that the gauge has in the FPR. It's right at the end of its threads and it took one last 1/4 turn before it would stop dripping. I've got a similar issue with the in-line pressure sensor, although there's plenty of threads left on that. I just didn't want to go too crazy with the tightening.

 

So, I want to be safe rather than sorry. What are my options for making sure all the seals are sound? Is PTFE an option? If it is, in my experience it's a pretty good one even though it won't be the neatest. If not, what's next? Some sort of loctite?

 

Thanks again :)

Link to comment
Share on other sites

I bought some of the fittings to connect my fpr up, from a local hydraulic hose manufacturer near me. I've used them for years, and they can make any hose and stock almost any threaded fitting you could wish for.

Anyhoo, I asked them what they would suggest, with helping to keep it fuel tight, and they said ptfe would be fine.

 

Most brass fittings are tapered, so an interference fit, but a bit of tape always helps

Link to comment
Share on other sites

The other type of seal to look at is a dowty seal, some gauge/sender units use them.

http://www.ebay.co.uk/itm/Dowty-Washers-Seals-Hydraulic-BSP-Oil-Fuel-Petrol-Seal-Washer-/301330648691

 

Unfortunately there's no actual land on the bolts to use a washer seal on.

 

 

You get teflon lined fuel lines, same stuff isn't it?

 

Yeah, that's why I thought it was probably a mix-up between gasoline and jet fuel.

 

 

I bought some of the fittings to connect my fpr up, from a local hydraulic hose manufacturer near me. I've used them for years, and they can make any hose and stock almost any threaded fitting you could wish for.

Anyhoo, I asked them what they would suggest, with helping to keep it fuel tight, and they said ptfe would be fine.

 

Most brass fittings are tapered, so an interference fit, but a bit of tape always helps

 

Sounds good, PTFE for the win. The fittings are all tapered (1/8 NPT) but they still aren't sealing until very late, tape should save the day :)

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. You might also be interested in our Guidelines, Privacy Policy and Terms of Use.