My LS1 speed fuel rails wont stop leaking...
04-26-2009, 11:56 PM
#1
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My LS1 speed fuel rails wont stop leaking... I got the LS1speed LS2 rails..and the fitting to rail leaks on 3 of the 4 corners..anyone have any ideas? The fittings screw all the way in and doesnt seem to seal..I used teflon tape as recommended but it doesnt help at all..
04-27-2009, 08:16 AM
#6
Sounds like some fubar pipe threads..
If the fittings screw in all the way, either the threads in the rails are too deep, and/or the fittings have undersized threads/incorrect taper.
There are 2 different types of pipe threads.
NPT=plumbers thread.
NPTF= pipe thread cut for use w/ fuel[s].
IMO, the correct type of connections are o'ring/straight thread.
Pipe threaded fittings look "hokey".. jmo, too.
Some added info here:
http://www.cutting-tool-supply.com/T.../NPTVsNPTF.htm
If the fittings screw in all the way, either the threads in the rails are too deep, and/or the fittings have undersized threads/incorrect taper.
There are 2 different types of pipe threads.
NPT=plumbers thread.
NPTF= pipe thread cut for use w/ fuel[s].
IMO, the correct type of connections are o'ring/straight thread.
Pipe threaded fittings look "hokey".. jmo, too.
Some added info here:
http://www.cutting-tool-supply.com/T.../NPTVsNPTF.htm
04-27-2009, 09:28 AM
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Sounds like some fubar pipe threads..
If the fittings screw in all the way, either the threads in the rails are too deep, and/or the fittings have undersized threads/incorrect taper.
There are 2 different types of pipe threads.
NPT=plumbers thread.
NPTF= pipe thread cut for use w/ fuel[s].
IMO, the correct type of connections are o'ring/straight thread.
Pipe threaded fittings look "hokey".. jmo, too.
Some added info here:
http://www.cutting-tool-supply.com/T.../NPTVsNPTF.htm
If the fittings screw in all the way, either the threads in the rails are too deep, and/or the fittings have undersized threads/incorrect taper.
There are 2 different types of pipe threads.
NPT=plumbers thread.
NPTF= pipe thread cut for use w/ fuel[s].
IMO, the correct type of connections are o'ring/straight thread.
Pipe threaded fittings look "hokey".. jmo, too.
Some added info here:
http://www.cutting-tool-supply.com/T.../NPTVsNPTF.htm
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04-27-2009, 09:57 AM
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I have Speed, Inc. LS1 rails, and they're 3/8" NPT threaded. If yours are the same (and, I assume they are), I have two suggestions. First, make sure you load up on teflon tape to get that extra bit of sealing. Also, tighten the fittings before you mount the rails to the intake manifold. I just used a wrench on the fitting on each side with some assistance from a friend, so we worked against each other to tighten the fittings. You can't really tighten them enough by relying on the two bolts holding the rail on the intake manifold to hold the rail still.
Some of this may seem obvious, but I thought I'd throw it out there.
Some of this may seem obvious, but I thought I'd throw it out there.
05-31-2009, 07:19 PM
#18
9 Second Club
Easier to use the right fittings for the rails.
And using teflon tape isnt a good idea. You wouldnt like a bit of tape to break off and block an injector.
Teflon paste is better
And using teflon tape isnt a good idea. You wouldnt like a bit of tape to break off and block an injector.
Teflon paste is better
