1- Fuel pressure regulator
2- A 15/16 in. wrench
3- Hold down the throttle lever to gain access
2- A 15/16 in. wrench
3- Hold down the throttle lever to gain access
1- Fuel pressure regulator
2- #40 TORX socket
3- Extension
4- Hole in throttle cable bracket
5- Ratchet
2- #40 TORX socket
3- Extension
4- Hole in throttle cable bracket
5- Ratchet
When the fuel pressure regulator(1) on the 3.1 and 3.4 engine fails, fuel leaks into the vacuum hose
at the top.This condition causes a hard start, long crank time, runs rough when started, and can also cause a
stall condition when coming to a stop.
This also causes poor fuel economy.
These pictures should help in the replacement of the regulator.
NOTE: Relieve fuel pressure first.
at the top.This condition causes a hard start, long crank time, runs rough when started, and can also cause a
stall condition when coming to a stop.
This also causes poor fuel economy.
These pictures should help in the replacement of the regulator.
NOTE: Relieve fuel pressure first.
The fuel pressure regulator is a vacuum operated diaphragm relief valve with fuel
pump pressure on one side and regulator spring pressure and intake manifold
vacuum on the other side. The fuel pressure regulator maintains a constant pressure
differential across the injectors at all times. The pressure regulator compensates for
engine load by increasing fuel pressure as the engine vacuum drops.
pump pressure on one side and regulator spring pressure and intake manifold
vacuum on the other side. The fuel pressure regulator maintains a constant pressure
differential across the injectors at all times. The pressure regulator compensates for
engine load by increasing fuel pressure as the engine vacuum drops.
| Great info! I think on my 1993 Buick 3.1 the regulator is under the intake tho? |
Comments
| Yes, on the older models the fuel pressure regulator is located under the upper intake plenum manifold. |
| What should the pressure be on These? i have a 2005 Monte Carlo ls with the 3.4 and I'm reading 30 only when the engine is running. At any other time the pressure is zero. |
| I think the fuel pressure should be about 45 PSI running. With engine off, if you are showing nothing, then it sounds like a bad fuel pump. |
| 55psi for start up, 49psi-52psi at idle, as high as 58psi through operating range is normal |
| What should the pressure be on a 2003 Buick Century? |
| A good rule of thumb is 45 PSI. |
| I have the 3.1 v6 Chevy Malibu. I took the hose off for 3 mintues, didn't see any fuel come out to suggest a problem. However, whenever the hose is put back on, I can hear humming while I'm sitting in the car with it running. I take of hose, no hum. Strange? Should I replace the regulator. Note: Just did fuel pump 4 days ago because it failed, also did fuel filter and pump relay just as a precaution. BTW, the sound is not coming from the back or the fuel pump, but in the front. |
| If this is an older 3.1L, then yes, replace the fuel pressure regulator. There was a design change years ago for making noise. |
| How do you relieve fuel pressure first? |
| Use the pressure tap - schrader valve on the engine with a pressure gauge installed or hose to relieve pressure into an approved container. |
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Leaking Fuel Pressure Regulator Replacement- 3100 and 3400 Engines
