What is the fuel pressure for a Subaru Legacy?

Fuel Pressure for Subaru Legacy
The fuel pressure for a Subaru Legacy varies based on different conditions. According to the information found in the search results, the fuel rail pressure for a Subaru Legacy should be around 36.3 psi above manifold pressure. This means that at idle, it should be approximately 26 psi, and at full stock boost, it should be around 45 psi.
If the vacuum line is pulled off the fuel pressure regulator at idle, the fuel pressure gauge should show less than 43 psi. If the pressure increases when the vacuum line is pulled off, it indicates that the fuel pressure regulator is functioning properly.
In summary, the fuel pressure for a Subaru Legacy should be around 26 psi at idle and around 45 psi at full stock boost.
If you need further assistance or have more specific questions about the fuel pressure for a Subaru Legacy, feel free to ask!

What is too high fuel pressure?

It really depends on the type of fuel system the engine has. If it is carbureted, anything more than 6 to 8 psi will cause fuel to be forced past the needle valve in the float assembly, and soon it will be flooding the engine through the vent tube. If it is on a fuel injection system, results will vary.

What is the fuel pressure for a 1992 Subaru Legacy?

The pressure should shoot up to about 36 psi, and a little fuel should come out the return line. If it’s higher, either there’s a blockage between the FPR and where you unhooked the line, or the FPR is bad. If it’s correct, then there’s a blockage between the tank and where you unhooked the line.

How do I know if my fuel pressure regulator is bad?

Your engine can start to stumble or sputter when this part is starting to go bad. This will happen when the vehicle is running. When you start your car, it is possible for the vehicle to stall out shortly after. Rough running can also happen as a result of a faulty fuel pressure regulator.

How do you test a Subaru fuel pump?

Locate the fuel pressure test port on the fuel rail. Attach a fuel pressure gauge to the test port. Turn on the ignition to prime the fuel system. Start the engine and observe the fuel pressure reading on the gauge.

What is the normal psi for fuel pressure?

30 to 50 PSI
This range can vary depending on the make and model of the vehicles, but for most gasoline cars, fuel pressure falls within the range of 30 to 50 PSI.

What is the average fuel system pressure?

The amount of fuel that an injector can flow is measured in pounds per hour. For rating purposes, most manufacturers specify a standard operating pressure of 43.5 psi. One exception is Ford, which rates its injectors at 39.5 psi as the standard pressure.

What is good fuel pressure for a car?

between 30 and 80 PSI
If the fuel pump doesn’t meet the required pressure specification, then the fuel pump may be failing to pump fuel to the engine. A typical port-injected vehicle requires fuel pressure between 30 and 80 PSI.

What is poor fuel pressure?

Generally speaking, low fuel pressure means you don’t have enough fuel getting to the engine, and/or you have too much air coming in. The fuel-to-air intake ratio is thrown off and it will cause engine performance issues. You may have trouble getting the car started at all when the fuel pressure is too low.

What is the normal fuel pressure at idle?

Idling you’ll be at approximately 15 ~ 20 inches of vacuum which means fuel pressure must drop by 15 ~ 20 PSI to maintain the correct pressure drop across your injectors. In other words 39 PSI base + 20 inches of vacuum at idle = 19 PSI fuel pressure at idle.

What PSI level is too low?

Tire pressure between 32 to 35 PSI is most suitable for most vehicles. However, one can go as low as 20 PSI (although that is not recommended). Anything below 20 PSI is considered a flat tire. PSI stands for Pounds per Square Inch.