5PSI 10Degrees Stock GReddy + Jim Pipes
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Senior Member
Joined: May 2005
Posts: 547
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From: San Francisco
braineack, this was the dyno sheet from the discussion I was having with you on Saturday. Here's the A/F It's stock fuel stock vortech. can i run an o2 clamp w/o emanage?
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Huh you're really fuel starved. Your stock pump really should do better. Do you have a fuel pressure gauge?
I see a walbro in your future.
I see a walbro in your future.
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You need to verify the condition of your pump. Looks like it can barely supply fuel. It could be working, the filter could be a restriction, or your plumbing could be wrong.
First off, verify your FMU is plumbed correctly. The fuel line from the OEM FPR should be connected to the offset fitting on the FMU. The center fitting shoulb be connected back into the return hardline. The line from the FEED line to the front of the fuel rail should not have been touched.
If this is correct then replace you fuel filter and buy a fuel pressure gauge and test your pump.
You'll need:
To Test The FMU:
First off, verify your FMU is plumbed correctly. The fuel line from the OEM FPR should be connected to the offset fitting on the FMU. The center fitting shoulb be connected back into the return hardline. The line from the FEED line to the front of the fuel rail should not have been touched.
If this is correct then replace you fuel filter and buy a fuel pressure gauge and test your pump.
You'll need:
1 - Fuel Pressure Gauge (on the cheap at any local hydraulics store, try to get one that can read to at least 125psi)
1 - 5/16" brass tee
1 - 1/8" NPT to 5/16" fitting (for the gauge, shop shoudl be able to help)
5' - 5/16" fuel injection hose
5 - Screw clamps
To install:1 - 5/16" brass tee
1 - 1/8" NPT to 5/16" fitting (for the gauge, shop shoudl be able to help)
5' - 5/16" fuel injection hose
5 - Screw clamps
Cut about 1' off the hose. Clamp that section to the brass tee. Clamp the 4' section to the tee as well. clamp the gauge on that 4' section.
Remove your fuel inlet hose from the hardline (otherside connects to the front of the fuel rail) and connect that to the tee. Then connect the 1' section of hose to the hard line.
To Test The Pump:Remove your fuel inlet hose from the hardline (otherside connects to the front of the fuel rail) and connect that to the tee. Then connect the 1' section of hose to the hard line.
Start the car. Idle should be 35-36psi. Remove the vacuum line from the OEM FPR on the fuel rail. (Kink the vacuum hose so the car doesn't die). Idle should be 48-50psi.
Stop the car. Jump GND & F/P in the diagnostics box. Turn the car to ON, but don't start it. This will run the fuel pump. wrap cloth around the return line and use a vice grips or something similar and clamp down on the hose. This will increase the fuel in the rail. Verify 75-85psi.
If your pump cannot supply this amount then it may be in need of replacement.Stop the car. Jump GND & F/P in the diagnostics box. Turn the car to ON, but don't start it. This will run the fuel pump. wrap cloth around the return line and use a vice grips or something similar and clamp down on the hose. This will increase the fuel in the rail. Verify 75-85psi.
To Test The FMU:
Ignition to ON. Keep the GND & F/P jumped. Run 5psi of air from an air compressor into your FMU vacuum line. Verify the fuel pressure increases to the max pump output.
hope this helps. can you send those .drf files this way?
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The clamp prevents "lean tip-in" by substituting the o2 sensor voltage output with another voltage, not allowing the ecu to cut fuel.
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Thread Starter
Senior Member
Joined: May 2005
Posts: 547
Total Cats: 0
From: San Francisco
Braineack,
I'm thinking of doing the dual feed fuel rail and installing 1.8s while I'm at it. over on .net you said to use 21/64" Drill bit
1/8" NPT tap
1/8" to 5/6" brass ftting
5/6" Brass Tee
2 - 1' sections of 5/6" fuel injection line
JB Weld
Grease
5/6" Hose Clamps
is it 5/16 or 5/6?
http://forum.miata.net/vb/showthread...ight=feed+rail
I'm thinking of doing the dual feed fuel rail and installing 1.8s while I'm at it. over on .net you said to use 21/64" Drill bit
1/8" NPT tap
1/8" to 5/6" brass ftting
5/6" Brass Tee
2 - 1' sections of 5/6" fuel injection line
JB Weld
Grease
5/6" Hose Clamps
is it 5/16 or 5/6?
http://forum.miata.net/vb/showthread...ight=feed+rail
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