Question about 2001 Ford Focus

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Ford focus fuel pressure

What is the PSI of the stock regulator? Its an 2001 DOHC 2.0 What PSI can the pump deliver if I go to a adjustable regulator. I need more pressure I run e-85 and have to have more volume thru the injectors.

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  • DFre207726 Sep 11, 2008

    I have ran it for almost 3 years, and It has run great. I've had to replace the fuel filter one time because the alcohol gelled the old gas that was in the tank but it took 6 mos for it to go bad. Had to get bigger plug wires to handle spark. still not sure what gap to run on plugs. I have cold air kit and header with no cat on it. The performance is so much higher and the use of fuel is the same. How do I increase the pressure to get more thru the injectors? Replace the chrome Disc regulator? What PSI is it set at? I have had problems lately in the morning getting it to start but after that it runs great.

  • yadayada
    yadayada May 11, 2010

    We are not going to help you cause a possiable fire due to fuel line and O ring failure problems caused by E85 in a non E85 application.

  • yadayada
    yadayada May 11, 2010

    I agree with fastboyz, everything is different, the fuel lines are make of nylon the computer has completely different programming, all the rubber seals will dissolve if they are not for E-85

    Talk to Ford about this, they will advise you.

  • paul erickson
    paul erickson May 11, 2010

    your in for alot of trouble trying to run E85 in this car it was not built to run this fuel . hope you like to replace alot of fuel related parts. do your research on E85 cars. dont want to be mean but you can ruin your car just trying to help. the focus can run a 40% blend in the summer without any problems.

  • Anonymous Mar 18, 2014

    have 39 -40 psi

  • Anonymous Mar 20, 2014




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You are interferring with something you know nothing about,dont you have an annual vehicle inspection to check that vehicle conforms to whats on the paperwork,or are using this just for track .as a vehicle with this sort of modification with no cat on either is illegal to use on the road.the brakes cant cope with extra power the suspension ,the chassis in fact everything is not designed for this if you want a faster car buy a nice jag or a porsche evan consider ferrari or lamborgini

Posted on Nov 12, 2008


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What cause fuel system to loose pressure new fuel pump installed also new filter & relay pump cranks 65 psi a run until pressure drops and quits, it might start, fuel pressure regulator ?

if it cranks at 65 psi the problem will not be in the regulator as the pump is producing enough fuel to exceed what the injectors need
What is happening is that the pump is not capable of delivering enough fuel to maintain that pressure when running so look for venting problems , hoses collapsing internally or blockage in the tank pick up

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What should the fuel pressure be at idle

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1 Answer

Fuel system on an 05 mustang is a return less system I'm going to turn it to a return and i have some parts fuel regulator,fittings, dual pumps , fuel line. So I'm i going to need a an electronic pump...

ok the returnless system is totally differernt.
the regulator is in the pump and tank,
not knowing the reason, we can not help you,
running 2 pumps, huh? a lift pump and a pusher pump, what?
1: turbo added
2: for fun?
3: dont like loopless.

the stock system has a loop , its just dont leave the tank.
some cars have a mini tank near the fuel rail.
but most use the tank loop.
the pump is regulated then the return goes back to the main gas tank
the OEM Ford and others, puts a fuel pressure sender there.
because there is no vacuum regulator at the rail
the PCM then reads the pressure and adjusts pulse width to the injectors based on load .
The old system used vacuum to control the pressure directly
the new system Does not do that. at all.
there is no vacuum line going to the fuel tank
and at full throttle there is no vacuum at the injector tips
and as such will squirt too much fuel so the regulator drops the pressures about 6 psi. (from idle pressure)
here is what needs to happen.
you just need a pump that works. and is rated for WOT fuel flow.
and the correct pressure set to factory spec, ford, pressure.
then use any manual regulator to set the pressure spec, pressure.
it never changes, then the stock fuel pressure sensor will report that
and the PCM does all the heavy lifting (calculations by magic)
that is how it works.

not knowing what you are doing so we can get on the same page makes all this impossible.
you are re-engineering the fuel system. so.... need to know that.

Im here,???
i want to go there. where and why.?
go to amazon dot com, type in greg banish books.
bingo read his books, (i have it on NOOK) for cheap.
it covers how loopless works and how it is tuned, to the finest details.

most folks down know why MPI systems drop 6PSI at wot.
it is because the reg is 1:1 reg for each pound of air pressure drop
so does the fuel pressure.
this magic on the old cars, keeps the differential pressure
ACROSS the injector the same at any throttle angle.
you car don't do that. at all. now.

and if you made it do that , id bet the PCM would go quite nuts.
it wants a static pressure. now.

Jun 06, 2014 | Cars & Trucks

2 Answers

Fuel pressure 1998 jeep grand cherokee 4.0 L V6

You should have a test port on the Fuel Supply rail, use a tool from a local auto parts "Tool Loaner program" where you can borrow tools for free,w/a deposit of course,then follow the steps provided;

MPI Fuel System Pressure Test

The MPI fuel system used in vehicles equipped with a 4.OL engine employs a vacuum balanced pressure regulator. Fuel pressure should be approximately 55-69 kPa (8-10 psi) lower with the vacuum line attached to the regulator than with the vacuum line disconnected. System fuel should be 214 kPa (31 psi) with the vacuum line connected to the regulator and 269 kPa (39 psi) with the vacuum line disconnected. CAUTION: Some fuel may be discharged when connecting fuel gauge to fuel rail.
  1. Connect a 0-414 kPa (0-60 psi) fuel pressure gauge to test port pressure fitting on fuel rail (Fig. 7).
  2. Remove vacuum line from pressure regulator.
  3. Start the vehicle.
  4. Note gauge reading. With vacuum line disconnected, fuel pressure should be approximately 269 kPa (39 psi).
  5. Connect vacuum line to pressure regulator. Note gauge reading. Fuel pressure should be approximately 214 kPa (31 psi).
  6. If fuel pressure is not approximately 55-69 kPa (8-10 psi) higher with vacuum line removed from regulator, inspect pressure regulator vacuum line for leaks, kinks or blockage. CAUTION: Fuel pressure will rise to as much as 655 kPa (95 psi) when the fuel return tine is pinched shut, shut engine down immediately after pinching oft fuel return line.
  7. If fuel pressure is low, momentarily pinch shut the hose section of the fuel return line. If fuel pressure remains low, inspect the fuel supply line, fuel filter, and fuel rail inlet for blockage. If fuel pressure rises replace fuel pressure regulator.
  8. If fuel pressure is above specifications, inspect the fuel return line for kinks and blockage.

Capacity Test

  1. Remove the cap from the pressure test port in the fuel rail.
  2. Connect a 0-414 kPa (0-60 psi) fuel pressure gauge to the pressure fitting on the fuel rail (Fig. 7).
  3. Start the vehicle. Pressure should be approxi- mately 214 kPa (31 psi) with the vacuum hose connected to the pressure regulator and 269 kPa (39 psi) with the vacuum hose removed from the pressure regulator.
  4. If the pressure is not to specification, check the following before replacing the fuel pressure regulator:
  • 4a - Inspect the fuel supply and return lines/hoses for kinks or restricting bends
  • 4b - Check the fuel pump flow rate. A good fuel pump will deliver at least 1 liter of fuel per minute with the fuel return line pinched off. If the fuel pump does not pump adequately, then inspect the fuel system for a plugged fuel filter or fuel pump inlet filter (sock). Fuel pump flow rate can be done by connecting one end of an old A/C gauge hose to the fuel test port on the fuel rail and inserting the other end of the hose into a container of at least 1 liter capacity. Run the fuel pump by installing a jumper wire into diagnostic connector terminals D1-5 and D1-6. Be sure to pinch off the fuel return line or most of the fuel will be returned to the fuel tank.

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2 Answers

How to check fuel pressure 91 geo storm gsi

1.6L DOHC (same way as the ISUZU impulse ) same car.
4XE1 engine twin cam.
has MPI injection with fuel rail, regulator and loop
disconnecting the feed line and stuffing it with guage only does 1 of 5 tests. done on MPI. it does JUST the shut test.
the correct way it to check it at the filter or rail tests ports on most cars.
in some cases you must add it.
they sell banjo fittings with test ports at summit racing dot com.
so the first question on all MPI cars, is , where is the stock fittings.
other cars the rail has a schrader valve or a plugged hole to add one. (test port) did you look first for this?
to test the FPR, unplug the vacuum line running
and pressure will jump up 6 to 10 psi.
this simulates wide open throttle pressure, a key fact in getting full power from engine, i test cranking presssure, idle, 3000rpm
and wot pressures to be sure the PFR is working, not just the pump.

the spec at the rail is.

Late 1986 to 1993 I-TEC MPFI system (after VIN 0908197)
Regulator vacuum line connected-36 psi
Regulator vacuum line disconnected-42.5 to 45 psi

the shunt test can hit 60 pis easy. do so for only 5sec.
as this stresses the pump .

the only rail drawing , shows no fittings (cheap buggers)

not even a cheap plug...

24024302-wtht4tipiqsxmsfaksxjx4vs-4-0.jpg below is the twin cam, 1.6L
buy a TEE feeting, and put it at upper, red arrow.
use clamps rated for fuel injection, not chezzy screw band clamps as seen on carb cars. use the correct parts.
or you will get leak and it will not be pretty,
the filter as at 14 ID. this is the pressure feed side of the loop.
30 to 60psi , so all parts must be rated over 60, psi, (100psi is a nice goal)


now the words directly from the IMPULSE FSM.

  1. Relieve the fuel pressure.
  2. Disconnect the fuel line near the engine and install fuel pressure gauge T-connector in the line.
  3. Connect the fuel pressure gauge to the T-connector.
  4. Start the engine and check the fuel pressure, it should be:
  5. 4XC1-Turbo and DOHC I-Mark, G200Z Impulse: 35.6 psi with the vacuum hose of the pressure regulator disconnected and plugged. 28.4 psi with the vacuum hose connected and at idle.
  6. 4ZC1-Turbo, 4ZD1 Impulse and 4ZE1 engine: 42.6 psi with the vacuum hose at the pressure regulator disconnected and plugged. 35.6 psi with the vacuum hose connected at idle. Disconnect the VSV before checking pressure.
  7. V6 engine: 9.13 psi at the fuel pressure line after the fuel filter.
  8. 4XE1 SOHC and DOHC engine: Flow test, disconnect the hose from the EFI fuel feed line at the engine and place in a suitable container. Apply battery voltage to the fuel pump. Pump should supply 1/4 quart (0.24L) within 15 seconds. Pressure test, connect a pressure gauge in the fuel pressure line after the fuel filter, located at the driver's side frame rail. Disconnect the vacuum hose from the pressure regulator. Apply battery voltage to the pump. After the pump stabilizes, the pressure should be 35-38 psi (245-256 kPa) and hold steady.

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1 Answer

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.

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Feb 02, 2010 | 2000 Ford Focus

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