LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Fuel Pressure Gauge Sending Unit

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Old Oct 19, 2009 | 07:22 PM
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Default Fuel Pressure Gauge Sending Unit

What fittings do i need to mount the fuel pressure sending unit to my schrader valve?

I attached a small picture of the sending unit. Its the type that comes with the cyberdyne and glowshift gauges.
Attached Thumbnails Fuel Pressure Gauge Sending Unit-sending-unit.jpg  
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Old Oct 20, 2009 | 09:34 AM
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okay so my gauge came in the mail today. anybody know what fitting i need for the schrader valve?
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Old Oct 20, 2009 | 10:59 AM
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Others will correct me if I am wrong, but I believe the rail fitting is 1/4 NPT male and your sending unit is 1/8 NPT male, so you just need a female to female reducer. And of course you will have to remove the valve core with a bicycle valve core tool.
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Old Oct 20, 2009 | 11:29 AM
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EAR-998604ERL -4an male to 1/8" female 90 degree
EAR-915104ERL -4an female to -4an female

This is what I used, and it doesn't leak. I used the 90 as there is no way in hell the sending unit should be able to clear the cowl installed directly to the valve.

I am using a Autometer though, maybe the sending unit threads are different on the other brands?
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Old Oct 20, 2009 | 12:17 PM
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Yeah I have the Glowshift gauges and that sending unit but I dont' remember entirely what I got. I had a -4an to 1/4 or 1/8 adapter which was like $15 and then a stupid little 90 degree piece.
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Old Oct 20, 2009 | 12:36 PM
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thanks guys that 90 degree piece is on backorder at both summit and jegs. im trying to find a spot that has it in stock.
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Old Oct 20, 2009 | 01:03 PM
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Just remember, -4 AN == 1/4 NPT.
If you wanted an elbow, I believe this will work and allow you to keep the Schrader valve. Edelbrock 76512 (at Summit, so I can't provide the link).
Other folk, please verify.
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Old Oct 20, 2009 | 01:10 PM
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Alot of guys will recc to put an adapter hose on the schrader valve fitting instead of mounting the sending unit directly there as the neck of that fitting/valve is very weak on the fuel rail. Plus the vibrations and heat of the motor are not good on the sending unit. With this setup you can remotely mount it on the firewall or behind the PCM or brakebooster. Look for Enjuneer's post on Camaroz28.com as he has a great writeup on this. Good luck.
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Old Oct 20, 2009 | 01:23 PM
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Well I'll just say I've had this for about three years setup this way, no issues. I could be wrong on this, but with the fuel flowing there shouldn't it keep it semi-cool? Once again no issues with breaking my fuel rail there, or sending unit problems.

I am interested in this hose idea though as I may have to do a t fitting or something down the road when I spray, perhaps then that would be a lot of weight there..
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Old Oct 20, 2009 | 02:20 PM
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Originally Posted by DAVE00
Look for Enjuneer's post on Camaroz28.com as he has a great writeup on this. Good luck.
Just look through all 36,658 posts and you'll find it straightaway.
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Old Oct 20, 2009 | 02:26 PM
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I used brass fittings from home depot.
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Old Oct 20, 2009 | 02:32 PM
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Originally Posted by whytryz28
I used brass fittings from home depot.
which ones?
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Old Oct 20, 2009 | 05:24 PM
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If you go that route, the easiest would be a 90 degree elbow, female 1/4 NPT to female 1/8 NPT. Or 1/4 f - 1/4 f then a 1/4 m - 1/4 f reducer. Just take the sending unit with you and match it up. Be creative. And I personally found my local Ace Hardware had a better selection of fittings, plus helpful folk to guide you through the maze. The other h/w stores around here don't seem to offer that.
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Old Oct 21, 2009 | 12:34 PM
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Just found the perfect fitting. Earls 361-100201. All I need is that one fitting and a cap for the top portion.
Attached Thumbnails Fuel Pressure Gauge Sending Unit-361-100201.jpg  
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Old Oct 21, 2009 | 02:59 PM
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The cap from your fuel rail Schrader valve should fit it, you'll just have to remember that ther is no check valve inside anymore.
And congrats.
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Old Oct 21, 2009 | 03:26 PM
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Originally Posted by koolaid_kid
you'll just have to remember that ther is no check valve inside anymore.

i see a little fuel spillage in my future.
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Old Oct 21, 2009 | 05:03 PM
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Originally Posted by camar0corey
EAR-998604ERL -4an male to 1/8" female 90 degree
EAR-915104ERL -4an female to -4an female

This is what I used, and it doesn't leak. I used the 90 as there is no way in hell the sending unit should be able to clear the cowl installed directly to the valve.

I am using a Autometer though, maybe the sending unit threads are different on the other brands?
+1

just make sure to use pipe sealant and stuff
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Old Oct 30, 2009 | 11:52 PM
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used the part i listed above. worked like a charm.
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Old Dec 31, 2012 | 03:22 PM
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Originally Posted by koolaid_kid
Just remember, -4 AN == 1/4 NPT.
If you wanted an elbow, I believe this will work and allow you to keep the Schrader valve. Edelbrock 76512 (at Summit, so I can't provide the link).
Other folk, please verify.
I know this is a terribly old thread, but I came across it while searching for fuel pressure sending unit to fuel rail fittings.
The fuel pressure line is -4AN or 1/4" Male JIC (not 1/4 NPT). The sending unit is 1/8" M NPT.
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