Here is a copy/paste of parts I listed in your other thread.
# EAR-916104ERL (-4 Female to 1/8)
# EAR-991001ERL (1/8 NPT Coupling)
# SUM-800199 (Fuel Gauge)
If you look on the firewall side of your fuel rail you will notice a valve in the middle that looks like a car tire inflation valve but only bigger. This is the Schrader valve used for testing fuel pressure. The a/c system also uses them for low and high side connections. You remove the core inside the Schrader valve using a core remover or two small screwdrivers on each side of the core or a pick set, etc...(!Watch out for high fuel pressure and sparks!) The core is threaded and screws out (normal threads) You then attach this part. # EAR-916104ERL (-4 Female to 1/8)
The -4AN female part attaches to your -4AN male Schrader valve. You then attach this part. # EAR-991001ERL (1/8 NPT Coupling)
You are now set up to attach a fuel gauge with 1/8" male threads on the gauge. You don't have to buy from Summit but go look at the pictures so you see whats going on. You have to use thread sealant and if there are any leaks or anything ruptures going down the road you can kiss your Fiero goodbye. Possibly yourself and passenger as well. You could always take the above setup off when you are not testing it. And replace the core on the Schrader valve. Good Luck.
(edit- useless web links removed- see below)
[This message has been edited by Bubbajuju (edited 08-13-2008).]
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06:41 PM
jscott1 Member
Posts: 21676 From: Houston, TX , USA Registered: Dec 2001
i want to do one of these to my LX9 3500. it has the 04 grand am 3400 fuel rails....i have a fuel pressure gauge on shrader when i was measuring my fuel pressure to determin if i need a new fuel pump or not. it works and all, just dangling buy the rubber line not really my idea of seeing what my fuel pressure is everytime i pop the decklid.
------------------ 1987 Fiero GT built by my brother, merlot566jka, 3500 LX9 from 06 Malibu, WOT-TECH.com 1280 grind stage 3 cam, LS6 valve springs, 1227730 ECM conversion, Darrel Morse solid aluminum cradle mounts, Truleo headers modified to fit the 3500, 36# inectors, 70mm 4.3 throttle body adapted to 3500 intake, ported heads, upper and lower intakes, lightly polished, tcemotorsports.com crank trigger wheel, CenterForce dual friction clutch, Flowtech Afterburner muffler, 2.5" piping, cat deleted, EGR deleted, SinisterPerformance tuning, C6 Corvette exhaust tips. projected to be 35 MPG with a guesstimate of 250 hp to the wheels
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09:43 PM
doublec4 Member
Posts: 8289 From: Oakville, Ontario, Canada Registered: Jun 2003
I don't think a max 60psi gauge is enough if you're monitoring the fuel pressure under load? I attached one the other day and at idle it was around 60psi I think? Someone correct me if I'm wrong
I don't think a max 60psi gauge is enough if you're monitoring the fuel pressure under load? I attached one the other day and at idle it was around 60psi I think? Someone correct me if I'm wrong
If you PSI is 60 at idle then you have problems. It should be about 48 PSI or so at idle and climb as you give it throttle. Sounds like your FPR is stopped up or you have a return line kinked. Better double check that PSI and see what you get.
Originally posted by doublec4: Fie Ro, I don't think a max 60psi gauge is enough if you're monitoring the fuel pressure under load? I attached one the other day and at idle it was around 60psi I think? Someone correct me if I'm wrong
quote
Originally posted by MstangsBware: If you PSI is 60 at idle then you have problems. It should be about 48 PSI or so at idle and climb as you give it throttle. Sounds like your FPR is stopped up or you have a return line kinked. Better double check that PSI and see what you get.
I 'think' I checked the range before I ordered but I may be wrong....I know about the 48psi at idle, what is the max psi with the stock regulator ?
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07:39 AM
doublec4 Member
Posts: 8289 From: Oakville, Ontario, Canada Registered: Jun 2003
If you PSI is 60 at idle then you have problems. It should be about 48 PSI or so at idle and climb as you give it throttle. Sounds like your FPR is stopped up or you have a return line kinked. Better double check that PSI and see what you get.
Well the gauge seemed to be bouncing around a bit... I don't know if that was the gauge or the actual car...
if the fuel pressure is too high, what could be the effects?
(you can pm me, I dont want to hijack the thread)
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08:52 AM
jscott1 Member
Posts: 21676 From: Houston, TX , USA Registered: Dec 2001
Thanks jscott1, I'll try again. Hopefully they work this time.
Yes, thank you. I was wanting to do the same thing. You would think that since most if not all fuel rails have that fitting there would be kits to permanently attach a fuel gauge there, but not so much.
Originally posted by jscott1: Yes, thank you. I was wanting to do the same thing. You would think that since most if not all fuel rails have that fitting there would be kits to permanently attach a fuel gauge there, but not so much.
Don't know if link will take you there but the Fiero store sells a kit. http://www.fierostore.com/P...rowse.aspx?d=246&p=1 But thats the only one I've ever seen. It has a 90 degree fitting specific for clearing the intake on the 2.8.
[This message has been edited by Bubbajuju (edited 08-14-2008).]
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12:59 PM
jscott1 Member
Posts: 21676 From: Houston, TX , USA Registered: Dec 2001
Don't know if link will take you there but the Fiero store sells a kit. ... But thats the only one I've ever seen. It has a 90 degree fitting specific for clearing the intake on the 2.8.
I like the 90 degree swivel...but it's about 10 times as expensive as the Summit parts. Still thanks for the reminder.
I just went and checked and the cap from my 2.8 interchanges with the fitting on my 4.9, so I'm guessing the -4 AN is common among all GM engines, at least from the late 80s to 90s.
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09:14 PM
fieroguru Member
Posts: 12327 From: Champaign, IL Registered: Aug 2003
Am I the only one who was able to just remove the schrader valve assembly and be left with 1/8" NPT threads into the aluminum fuel rail? A simple brass 90 degree 1/8" NPT fitting (maybe $2) from the local hardware store and a liquid filled 0-100psi fuel gauge from Summit and I was done (and its been in there 3+ years).
This was on a SBC application, but I would suspect there are others that way too. Here is a crappy pic, but it is the closest one I have right now.
[This message has been edited by fieroguru (edited 08-14-2008).]
Originally posted by fieroguru: Am I the only one who was able to just remove the schrader valve assembly and be left with 1/8" NPT threads into the aluminum fuel rail?
fieroguru, I have a stock fuel rail and the Schrader valve is welded onto the rail. This is a stock 3800 rail. The 2.8 rails have the valve welded on as well. So hence all of the fittings. Nice fuel rails by the way. Hopefully one day I won't need the adapters either!
Originally posted by Matthew_Fiero: I ordered all those summit parts Only came to like 37 bucks
My order was $37 as well. Hey Matt, on the inside of the fitting on the gauge there is little set screw. Don't get curious and fiddle with it. I called Summit Tech and it's the calibration screw. I counted the thread turns when I fooled with it but I'm not completely sure it's back where it started.
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12:43 PM
Aug 18th, 2008
Alex4mula Member
Posts: 7405 From: Canton, MI US Registered: Dec 1999
... The 2.8 rails have the valve welded on as well. ..
That's not true. At least my 88 is not. If the bottom is 1/8" npt then it wold be better for me as I have very little clearance with the Truleo intake.
[This message has been edited by Alex4mula (edited 08-18-2008).]
Originally posted by Alex4mula: That's not true. At least my 88 is not. If the bottom is 1/8" npt then it wold be better for me as I have very little clearance with the Truleo intake.
Right on, thanks for the clarification.
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09:58 PM
qwikgta Member
Posts: 4669 From: Virginia Beach, VA Registered: Jan 2001
i need to quit putting off fitting my gauge to my fuel rail. but there is just the effin rain. your lucky to at least have a garage dwayne. and i do need to come back over to practice welding. gotta get all the scrap metal first. and ill buy you some rods since im killing all of yours learning.
------------------ 1987 Fiero GT built by my brother, merlot566jka, 3500 LX9 from 06 Malibu, WOT-TECH.com 1280 grind stage 3 cam, LS6 valve springs, 1227730 ECM conversion, Darrel Morse solid aluminum cradle mounts, Truleo headers modified to fit the 3500, 36# inectors, 70mm 4.3 throttle body adapted to 3500 intake, ported heads, upper and lower intakes, lightly polished, tcemotorsports.com crank trigger wheel, CenterForce dual friction clutch, Flowtech Afterburner muffler, 2.5" piping, cat deleted, EGR deleted, SinisterPerformance tuning, C6 Corvette exhaust tips. projected to be 35 MPG with a guesstimate of 250 hp to the wheels
Dang Matt. That is high. Even higher is that import tax! Here's a pic of mine on stock rails. I wonder if you have room to delete the coupler and get a 1/8" NPT galvanized 90º or 45º fitting from the hardware store? (typical plumbing part about 50 cents)
All of you installing gauges in fuel lines permanently should consider carrying a plug and tools to install it at all times.
Gauges, even quality ones, can start leaking with little, more like no, warning. Between the vibration in the fuel, engine vibration, heat, etc, a gauge can easily develop a leak. When it's loaded with fuel....
Gauges are moving, and rather delicate, parts. Leaking gauges are pretty common in allot of applications. Sticking one in an engine bay just adds to the likelyhood of a leak.
------------------ Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should. (Jurassic Park)
thank you
