Does anyone know what the fuel pressure is suppose to be on a 94 Lexus SC 300?
Lexus Q&AAsk Your Question
1994 Lexus SC300 Question: Fuel Pressure
Answer #1Hightec1 March 01, 2012, 14:30Technician
When vehicle is idling it should be 28 to 34 psi.
When vehicle is idling and vacuum hose disconnected from fuel
regulator it should be 38 to44 psi
Fuel regulator is on the fuel rail,round small canister with vacuum hose
connected to it.
Replygreiter, March 01, 2012, 14:54Rookie
So the engine stumbles and then dies. Can't keep it running. Should I rule out the fuel filter and go with a new fuel pressure regulator?
ReplyHightec1, March 02, 2012, 10:16Technician
What is your pressure readings?
Low readings could be a fuel restriction.
Replygreiter, March 02, 2012, 13:20Rookie
I just bought a new fuel filter thinking I would start with the least expensive first. Hopefully that will take care of it. I've heard it's kind of a pain to replace. Should I have my local mechanic do it?
Answer #2LEXUS LANNY July 10, 2013, 00:53Rookie
FUEL ECM IN ON DIVER SIDE BEHIND THE PANEL. it has come control over pressure depending on engine speed, which has,