spiderpigcity Posted July 4, 2008 Share Posted July 4, 2008 right then guys. i am in the middle of a single conversion and a load of other mods.i have fitted a lot of the boostlogic fittings eg , on the fuel rail, the fuel press reg, the oil drain for the turbo, the oil feed for the turbo. they all use npt or an threads. it says on the instructions that the fittings dont need ptf taoe as they are self sealing. i have mechanic friends who have told me the opposite. i am going to be really pi//ed off if i have to undo all the fuel system and the oil drains and feeds and sensors etc to put ptf tape on them. can anyone put me straight on this. thanks Quote Link to comment Share on other sites More sharing options...
RobSheffield Posted July 4, 2008 Share Posted July 4, 2008 Fuel system and oil drain, if JIC flare, wont need PTFE, some bits if NOT JIC flare will need it. Examples where it can be used - oil drain nipples into castings, fuel pressure regulator guage. Quote Link to comment Share on other sites More sharing options...
SimonB Posted July 4, 2008 Share Posted July 4, 2008 Tapered threads (i.e. NPT) need some form of sealer, either PTFE or preferably something like loctite 577. AN fittings you shouldn't use PTFE on. If it's a male thread going in to a port you need either a Dowty seal (basically a washer with a rubber bit in the middle) or some form of O ring if the port is designed for one. If it's a fitting that goes into another fitting there will be a cone shaped concave bit that the cone on the male fitting fits into. When done up tight these seal. For example, fuel connections into a pressure reg usually have a O ring. Oil drain from a turbo usually is NPT and needs sealing. Fuel rail fittings normally are designed to seal with a washer. Quote Link to comment Share on other sites More sharing options...
spiderpigcity Posted July 4, 2008 Author Share Posted July 4, 2008 both of you guys have contradicted each other, whos gonna make it 2 - 1? Quote Link to comment Share on other sites More sharing options...
SimonB Posted July 5, 2008 Share Posted July 5, 2008 both of you guys have contradicted each other, whos gonna make it 2 - 1? No we haven't. Rob said it won't need PTFE "if JIC flare" which is exactly what I just said. The fuel pressure reg gauge is a NPT fitting so will need some form of sealer. We both said exactly the same thing! Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted July 5, 2008 Share Posted July 5, 2008 If the fitting and pipe join using an inverse flare and a cone they DO NOT need, nor should you use any form of sealant. Quote Link to comment Share on other sites More sharing options...
bignum Posted July 6, 2008 Share Posted July 6, 2008 You can pressure test your fuel system without the engine running. Quote Link to comment Share on other sites More sharing options...
bromy Posted July 6, 2008 Share Posted July 6, 2008 Agree, JIC fittings seal off on the 37 degree taper and do not need any kind of sealer, NPT on the other hand seal off on the tapered thread and need some kind of sealer Quote Link to comment Share on other sites More sharing options...
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