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Fuel control regulator - 1997 Ford Puma

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Error code 2501, 2502 & 2504. Fuel pressure too high. What action should I take to rectify or check to resolve this please.

the only thing that controls the fuel pressure is the fuel pressure regulator
some are vacuum controlled , some electronic controlled
make sure that the return hose is correctly fitted , and that the regulator control is correctly hooked up
or if old regulator then replace it

Mar 11, 2016 | 2004 Volvo XC90

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Where is fuel pump relay on 2009 gmc acadia

Your vehicle has no fuel pump relay . Has a fuel pump flow control module .
Fuel Pump Flow Control Module (FPCM)
The fuel pump flow control module (FPCM) is a serviceable GMLAN module. The FPCM receives the desired fuel pressure message from the engine control module (ECM) and controls the fuel pump located within the fuel tank to achieve the desired fuel pressure. The FPCM sends a PWM signal to the fuel pump, and pump speed is changed by varying the duty cycle of this signal.
Plus it has two fuel pumps !
The high pressure fuel pump (9) is a mechanical one cylinder design driven by an eccentric on the exhaust camshaft (1) of bank 2. High pressure fuel is regulated by the fuel rail pressure (FRP) regulator, which is a part of the high pressure fuel pump. The FRP regulator is a magnetic actuator which controls the inlet valve of the high pressure pump. The ECM provides battery voltage on the actuator high circuit and ground on the actuator low reference circuit. Both circuits are controlled by the ECM. When the ECM deactivates the FRP regulator, both circuits are disabled and the inlet valve is held open with spring pressure. When the ECM activates the FRP regulator, the low circuit driver connects the low reference circuit to ground and the high circuit driver pulse-width modulates (PWM) the high circuit. The ECM uses the camshaft and crankshaft position sensor inputs to synchronize the FRP regulator with the position of the eccentric on the camshaft. The ECM regulates fuel pressure by adjusting the portion of each pump stroke that provides fuel to the rail. The high pressure fuel pump also contains an integrated pressure relief valve.
Your best bet is have it towed to the dealer , you don't want to mess with the high pressure pump .

Feb 27, 2016 | 2009 GMC Acadia SLT-2

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2000 Chevy 1500 4.8L has 20 lbs fuel pressure. Pump ? Pressure regulator ? Replaced pump GM recommended & still same problem

Fuel Pressure Regulator and Control at ...
AutoZoneShop for Fuel Pressure Regulator and Control products with confidence at Parts are just part of what we do.

Sep 24, 2015 | Cars & Trucks

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Have a 98 chevy s10 that will start but will not run

check the solenoid next to fuel pressure regulator on fuel rail,and the wiring to it ,or the bad relay at fuse box in engine compartment

Apr 21, 2014 | 1999 Chevrolet S-10

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Locate fuel volume regulator 1999 honda civic

EFI fuel pressure regulators come in various shapes and sizes but their purpose is the same- to hold the fuel pressure at a certain differential above the intake manifold pressure. The inner mechanism usually consists of a sealed diaphram chamber, a spring, a diaphram, bypass valve and a manifold pressure reference port. The valve is connected to the diaphram and the spring pushes against the diaphram from the manifold pressure side. The spring pressure determines the static fuel pressure. If there is vacuum on the port, say at idle, this reduces the effective spring pressure acting on the diaphram and reduces the fuel pressure under vacuum conditions. If there is pressure on the port, such as under boost, this effectively increases the spring pressure, thus fuel pressure.

Most OE regulators use a one to one ratio. At one psi of boost, it would add one psi of fuel pressure. This way there is always a constant pressure differential across the fuel injector. Most regulators have a static pressure of between 38 and 44 psi. The fuel pump always puts out an excess of fuel volume. The regulator controls the pressure in the fuel rail by bypassing any fuel not used by the engine back to the fuel tank once the control pressure is met. At idle, perhaps 95% of the fuel delivered to the fuel rail is returned to the tank. At full power, perhaps 5% to 50% of the fuel delivered is returned back to the tank. Fuel is generally routed from the pump to one end of the fuel rail which feeds the injectors. The regulator is usually mounted on the opposite end of the rail. This arrangement allows any hot fuel in the rail to be immediately purged back to the tank after a hot start to reduce vapor lock and fuel boiling. A similar arrangement should be used if you are fabricating your own fuel system.

Rising Rate Regulators Some aftermarket companies produce fuel pressure regulators which have a ratio of higher than one to one. These are intended for use mainly on engines which were not factoryturbocharged. Because the fuel injection system was never designed or mapped for the increased levels of airflow, fuel flow and manifold pressure, these regulators attempt to supply increased fuel under boost by vastly increasing fuel pressure. This is a bad idea for several reasons:

1. Fuel delivery varies as the square of the fuel pressure so you need 4 times the pressure to double the flow, say 160 psi in most cases.

2. The fuel injectors, hoses and fuel pumps were never designed to operate at this pressure. Pump life is severely reduced, injectors may not operate properly leading to a lean out condition and a component may fail causing a fuel leak and fire.

3. Fuel delivery under boost is now under the control of a mechanical device rather than the ECU so mixture control is crude at best.

The proper course is to use a system designed for turbocharged operation with appropriately sized injectors for the job. The OE regulator in most cases is well capable of controlling the pressure and because you can flow a lot of fuel through a 5/16 hole at 40 psi, they are entirely adequate up to 500 hp in most cases. There is no need to install larger fuel lines or massive regulators for most applications. Most aftermarket regulators are not required and a waste of time and money for street applications. They might be required at extreme hp levels on race applications or those using methanol where higher fuel flow rates demand larger lines and regulator passages. The fuel pump may have to be upgraded if the power levels are increased substantially over stock however.

Oct 21, 2012 | 1999 Honda Civic

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Is there anything else that controls the fuel other then ecm on 1993 Astro van

oxygen sensors
map sensor
mass air flow sensor
fuel pressure regulator
idle air control valve
throttle postion sensor
fuel injectors
egr valve
All these sensors send a signal to the ecm to regulate the air/fuel mixture.

Sep 07, 2011 | 1993 Chevrolet Astro

1 Answer


Fuel pumps do not have a speed control, but a pressure regulator that regulates the operation of the pump.
The regulator is on the engine, and the fuel punp is in the gas tank.

I hope this answers your question

Oct 17, 2010 | 1999 Buick Regal

1 Answer


po001 fuel volume regulator control ckt (open) po003 fuel volume regulator control ckt (low) po004fuel volume regulator control ckt (high) po006 fuel shutoff valve control ckt (low).

Apr 22, 2010 | 2003 Dodge Grand Caravan AWD

1 Answer

Open fuel regulator control

There are 2 fuel pressure regulators on your fuel rail. They are being held in by a clip. Just remove the clip and it will pop out. Don't forget about the seal.

Mar 31, 2009 | 2002 Mercedes-Benz CLK-Class

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