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Re: Fuel Pressure Regulator
All Fuel Pressure Regulators are usually attached to the Fuel Rail. In any case, they have a return line to the fuel tank. On your engine you may have to remove the pretty "Plastic Cover" that covers the top of the engine to see the fuel rail and the pressure regulator. Look for a "tube" that has fuel injectors going from the bottom of it and into the top of the intake manifold. The fuel pressure regulator is a round looking device attached to the end of the fuel rail with a small fuel line coming out the botttom and a vacuum line attached to the top of it. At least in most cases this is what it will look like.
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check for a problem fuel pressure regulator
most are wired to the ECM which is connected to the relay for the pump
it works like this
with low / no fuel pressure the regulator completes a circuit to the ECM
that signal is then sent to a relay to start the pump
when full pressure is reached , the regulator signals the ECM and the relay is turned off hence the pump is not continually running when pressure is not required
There not bad to replace, but you do have to have a special tool to unhook the fuel lines to it. And there should be just one set of wires goin to it also. It should take you about 20 minutes to change. If you have the right tools to do it.
many fuel pumps get there power from the relay that is energized by the ECM
there is a pressure regulator in the system that will report to the ECM to switch on the fuel pump when the pressure falls
if you have no power to the relay , it could be because the pressure in the fuel system is above cut in pressure or that pressure regulator is not passing the current to the ECM
Check the fuel pressure regulator. It is on the drivers side, front of the engine near the throttle body. Remove the vacuum hose and see if fuel comes out of the nipple. If it does than the regulator needs to be replaced.
If the regulator is fine than you will need to check fuel pressure with a gauge. If fuel pressure drops as soon as you shut off the car than the fuel pump is likely bad.
could be a bad fuel pressure regulator. if they do fail, then it may result in low pressure. Mostly, the diaphragm in
the fuel pressure regulator develops a leakage and the fuel enters the vacuum
hose. This may lead to various kinds of troubles in the engine. Signs of a Bad Fuel Pressure Regulator
The vehicle engine runs rough and often stumbles and sputters.
The engine will not start after ignition. Usually, this problem is
encountered in the morning when you start your vehicle. Many times, the engine
starts, but stalls shortly after starting.
The fuel pump in the vehicle becomes noisy at times.
A bad fuel pressure regulator can also result in fouled spark plugs.
Last but not the least, the fuel mileage of the engine decreases noticeably. if above signs appear, replace fuel regulator. Check the oil dipstick and see if you smell fuel on it. If you do, it could
be a symptom of a bad fuel regulator. The regulator has allowed gasoline to leak
into the oil system.
Sounds like your fuel pump is weak so i would check the fuel pressure first.The fuel pressure should be 40-47 psi with key on and engine off and 31-44 psi with engine running.If its not within these specs then replace the fuel pump.
start right back up? if it does , then pull the vacuum hose off the fuel pressure regulator and and a stall . if gas comes out of the regulator/and hose. Thats the problem , bad diaphram in fuel pressure regulator!! $45.00 @ auto parts store , snapring pliers is only tool you'll need!! ($5.00 tool) Chep and easy!! :) Hope this helps!! Richie
The fuel filter is located underneath the car in front of the gas tank.
You have release the fuel pressure. Remove the fuel filler cap, locate the fuel test port on the fuel rail on the passenger side on the end of the right real fuel rail for a 3.1L engine.
3.8L engine yhr test port is located at the pressure regulator under the trim cover.