Scott Posted February 1, 2015 Share Posted February 1, 2015 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 Quote Link to comment Share on other sites More sharing options...
bignum Posted February 1, 2015 Share Posted February 1, 2015 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 Quote Link to comment Share on other sites More sharing options...
Swampy442 Posted February 1, 2015 Share Posted February 1, 2015 You get teflon lined fuel lines, same stuff isn't it? Quote Link to comment Share on other sites More sharing options...
Mk4Gaz Posted February 1, 2015 Share Posted February 1, 2015 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 Quote Link to comment Share on other sites More sharing options...
Scott Posted February 1, 2015 Author Share Posted February 1, 2015 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 Quote Link to comment Share on other sites More sharing options...
Mk4Gaz Posted February 1, 2015 Share Posted February 1, 2015 Mine was the same, even fully nipped up, I had a tiny weep. Bit of tape sorted it Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted February 1, 2015 Share Posted February 1, 2015 IMO its just a case of common sense, if your using a sealing tape just make sure you only use it where its unlikely to ever get into fuel system. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 1, 2015 Share Posted February 1, 2015 PTFE tape = No Loctite Hydraulic Seal = Yes. It's not that PTFE tape degrades in petrol, it's the risk the thread form tears bits off which can choke up the injector filters. Quote Link to comment Share on other sites More sharing options...
Scott Posted February 1, 2015 Author Share Posted February 1, 2015 PTFE tape = No Loctite Hydraulic Seal = Yes. It's not that PTFE tape degrades in petrol, it's the risk the thread form tears bits off which can choke up the injector filters. Loctite 542 sound ok? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted February 1, 2015 Share Posted February 1, 2015 That's the stuff I have used for years. Never had any issues. Quote Link to comment Share on other sites More sharing options...
Scott Posted February 2, 2015 Author Share Posted February 2, 2015 I've got PTFE so I'll order up some loctite and see how I get on with it. Thanks Quote Link to comment Share on other sites More sharing options...
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