Fuel pressure regulator pictures
Thread Starter
Safety Car
Joined: Nov 2005
Posts: 3,961
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From: Lompoc, CA. Santa Barbara County
Fuel pressure regulator pictures
Tonight I installed a Holley fuel pressure regulator because my gauge was reading 9 psi and It was flooding slightly. The regulator is supposed to be factory set at 5 psi, but when I started the car, it read 9 psi again. I wonder if the guage is good. It's fluid filled and old. I shoulda checked that first. Oh well.
Thread Starter
Safety Car
Joined: Nov 2005
Posts: 3,961
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From: Lompoc, CA. Santa Barbara County
Originally Posted by DWncchs
Curious why you didnt buy regulator with return to tank?
Thread Starter
Safety Car
Joined: Nov 2005
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From: Lompoc, CA. Santa Barbara County
Originally Posted by Twin_Turbo
I see teflon tape on the AN flare connections, those are flared and the 37 degree seat creates the seal, no teflon should be used. The threads themselves are non sealing, just regular UNC threads.
Le Mans Master
Joined: May 2006
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From: League City Tx
Use teflon paste so the tape doesn't break apart and get pushed into the fittings, regulator and the carb. No return is really needed. Just cap off the return line on the frame to keep stuff from getting up in the line/tank.
I would be suspect of your gauge. The gauge on my dad's 59' just crapped out also. It used to read 5-6psi all the time with an electric holley blue pump and regulator. Then the gauge started reading 3 psi. he would adjust the regulator and the gauge would read up or down but once he set it to 6 psi and it started blowing past the needle in the carb. Turns out the gauge was reading 3 psi low.
Try a different gauge BUT don't trust the preset settings on the regulator.
I would be suspect of your gauge. The gauge on my dad's 59' just crapped out also. It used to read 5-6psi all the time with an electric holley blue pump and regulator. Then the gauge started reading 3 psi. he would adjust the regulator and the gauge would read up or down but once he set it to 6 psi and it started blowing past the needle in the carb. Turns out the gauge was reading 3 psi low.
Try a different gauge BUT don't trust the preset settings on the regulator.
Le Mans Master
Joined: May 2006
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From: League City Tx
Originally Posted by redvetracr
you NEVER EVER use teflon tape/paste on an AN fitting...pipe thread yes, AN NO!!
...redvetracr
...redvetracr
+1
forgot to tell ya that, only paste the pipe side, not the AN side. Those go on with no type of sealer.
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Race Director
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exactly...someone out there is feeding bad info, the guy w/ the buildup 82 thread had teflon tape on his also and I've seen a few others as well. just like red says, on pipe thread yes, on flared connections..whatever they are (45, 37 degree, tube/nut assembly...doesn't matter) a flared connection uses the flared surface as the seal, on a pipe thread the taper creates the seal but requires a sealant (teflon tape..or other)
To prevent galling ONLY use a light machine oil, nothing else. If you buy high quality fittings with high quality threads (XRP, Aeroquip) you won't have galling, use quality adapters/forged elbows and such also. It's the cheap stuff that can have bad threads and mess up your fittings. There's a difference between the high quality aircraft type AN threads and the lower quality automotive and JIC threads.
To prevent galling ONLY use a light machine oil, nothing else. If you buy high quality fittings with high quality threads (XRP, Aeroquip) you won't have galling, use quality adapters/forged elbows and such also. It's the cheap stuff that can have bad threads and mess up your fittings. There's a difference between the high quality aircraft type AN threads and the lower quality automotive and JIC threads.
Race Director
Joined: May 2006
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From: Dayton, Ohio
Guys I have a question on teflon and the AN fitting.I understand that the AN seals on by the flare and seat,and the pipe seals by the threads.I have always understood that teflon paste has no sealing capabilites and it serves only as a lubricant to allow the pipe thread to go in further there by the threads seal.If this is correct then on an AN fitting wouldnt this allow (if used ONLY on the threads)the flare to be formed with less actual torque because the threads are lubricated and more actual force is applied to the seat with less torque on the nut?I am referring to the paste and NOT the tape--I understand if the tape got on the flared seat it could cause a leak.Plus you wouldnt want bits of the tape in the system.Just curious.
Race Director
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it may leak as with the teflon you possibly can not thread the 2 pieces together tight enough to allow the flare surface to create that seal, the threads will be the seal. They are not designed to do this. It's not that you don't NEED to use it, you MUST not use it.
Race Director
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From: Foxfield CO 1970 Convertible
Originally Posted by Twin_Turbo
it may leak as with the teflon you possibly can not thread the 2 pieces together tight enough to allow the flare surface to create that seal, the threads will be the seal. They are not designed to do this. It's not that you don't NEED to use it, you MUST not use it.
The fitting shop out here has a sign on the counter - don't use teflon on AN fittings. They did say that it was OK to use on your toilet...
http://www.aeroquip.com/pages/perfor...ical_info.html FAQ page - check near bottom.
Last edited by Z-man; Dec 7, 2006 at 03:37 PM.
Race Director
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From: Florida
If you are worried about galling or corrosion seizure, you can put a thread lubricant/antiseize compound on the threads only.
This serves 2 purposes,
1-to lubricate the thread for proper torque,
2-to prevent seizing fro oxidation or rust, long term.
I have been using a copper antiseize compound for years on everything I can.
This serves 2 purposes,
1-to lubricate the thread for proper torque,
2-to prevent seizing fro oxidation or rust, long term.
I have been using a copper antiseize compound for years on everything I can.
Burning Brakes
Joined: Aug 2002
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From: Scottsboro Alabama
Bee Jay, here's a thread where Lars comments about using a non bypass style regulator with a return system. Also holley makes a bypass version of the same regulator you have ....about 57 bucks.
http://forums.corvetteforum.com/show...um_id=3&arch=1
http://forums.corvetteforum.com/show...um_id=3&arch=1
