Fuel Pressure

[80 hate]

My fuel pressure jumped to over 60psi today. Can a regulator going bad cause that big of a jump? Also is anyone running the Russell fuel lines that American muscle sells?

[Rick93coupe]

Im not 100% sure but since it's supposed to regulate the pressure, I'd assume its possible that you could get a pressure rise. I never monitored a factory style regulator before and never had an aftermarket one fail. A pinched/crushed return line could also raise the pressure. If you start the car and pull the reference line and there's fuel in that line, it's time for a replacement.

[80 hate]

When you say the "reference line" do you mean the vacuum line to the regulator? Thanks for your help Rick93coupe.

[SnailPony]

I ran the Russel lines, never had an issue with them.


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[Rick93coupe]

Yep, the line from the intake manifold to the regulator. When a regulator diaphragm fails, fuel gets drawn up the hose because there's a vacuum on it. You're welcome.

[80 hate]

well, from one problem to the next. I pulled the upper intake and replaced the fuel pressure regulator. I also replaced some warn vacuum hoses and PCV valve. I have everything back together and it runs like crap. check the hoses to make sure everything is correct. I have my fuel pressure set at 43psi.
The car feels like it has a miss to it. Anyone ever had this happen or ideas on what could it be?

[draggin50]

Check the plugs? May have fouled one out. Did the regulator fix your fuel pressure issue?

Sounds like a vacuum leak somewhere. Double check the vacuum lines.

[80 hate]

Fuel regulator fixed the fuel pressure issue. I did a smoke leak test on the car today. The only place that had a leak was the throttle body. It was leaking out the throttle shaft on the bottom. Is this normal? No leak anywhere else. New plugs tomorrow.

[draggin50]

A small amount is probably normal. It would take something larger than that to make it miss bad.

Id try dropping the fuel pressure down around 39-40 also. Depending on your combination I guess.

[80 hate]

Changed the plugs last night. No change. I'm going to check the TPS sensor tonight. If this doesn't work I'm not sure what to do next. Anybody have any ideas?

[80 hate]

UPDATE. It was my throttle body. Big thanks to Mike Bell for the MAC 70mm throttle body and advice. Running better than ever now.

[Kwik92GT]

Awesome! Glad you and Mike got it figured out!

[draggin50]

Glad you got it figured out!

I need to get a hold of Mike sometime.