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.
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.
Fuel pressure regulator replacement- 3.1 / 3.4 engine
WARNING LIGHTS
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.
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| 12-4-11 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. |
| 12-9-11 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. |
| 12-9-11 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. |
| 12-26-11 55psi for start up, 49psi-52psi at idle, as high as 58psi through operating range is normal |
