Unscrew and carefully remove the fuel injector retainer, which holds the fuel injector in place.
6 - once the fuel gauge had been attached,Turn the ignition key to the "on" position.
Of you may recall the in-tank fuel pump (holley's 255-lph, high-volume unit) upgrade we performed on associate editor mike johnson's '89 lx ("get pumped" p.
Following video shows you how to replace a fuel pressure regulator on an early efi system.
, you have your new adjustable fuel-pressure regulator installed, but you're lost on how/where to set the pressure for your 'stang's 5.
Turn the ignition key to the on position and check for fuel leaks around the new pressure regulator.
How do you install a fuel pressure regulator
After reinstalling any shields or covers to the engine, and replace the fuel pump fuse, if you had to remove it.
. it's a direct replacement for the nonadjustable, factory unit and is a must for cars with fuel-pump/injector/rail upgrades, and, of course, any of the big three power-adders.
The fuel pressure regulator and remove it, this line should be free of fuel,If fuel is observed the regulator has failed.
While the fuel pressure "drop" with the introduction of vacuum to the regulator varies from car to car, sam at coastal chassis dyno believes that mike's lx may have lost roughly 4 or 5 pounds of fuel pressure once the vacuum line was reattached.
An optimum (naturally aspirated) air/fuel ratio for good street performance is said to be 12.
An adjustability range of 30 to 60 psi, holley's billet, adjustable fuel-pressure regulator (pn 512-509; 5) is made specifically for '86-'94 efi, street 5.
How do i install a fuel pressure regulator
Depending on your particular model, your fuel pressure regulator may include a pressure regulator cover, regulator diaphragm cup, diaphragm spring, regulator body, regulator diaphragm, and regulator outlet tube.
Remove the air cleaner assembly from the throttle body injection unit to gain access to the fuel pressure regulator.
After relieving fuel pressure from the system, remove any covers to gain access to the fuel pressure regulator.
Hp and 320 lb-ft of torque after installing holley's adjustable fuel-pressure regulator and setting pressure at 39 psi.
The never-ending saga of our man johnson's ride, the factory regulator is still in place after nearly two years of daily driving with the high-volume pump, and laughing in the face of a nitrous shot that's always at the ready.
While in most cases the eec system has the ability to compensate for small changes in fuel pressure and will adjust the injector pulse width accordingly for the best air/fuel ratio at all times, the incorrect reference could result in damage to your engine (if you're using a power-adder), as the air/fuel mixture could end up dangerously lean.
You replace the fuel pressure regulator, it's a good idea to maintain the system to prevent engine performance problems.
Add a quality fuel additive to the fuel tank at least twice a year to keep fuel injectors clear and remove buildup.
Note: on some vehicle models, it's necessary to remove an intake plenum to reach the regulator.
Remove the vacuum line from the regulator,If fuel is present, the regulator has failed.
Air/fuel ratio is one of the measurements of record when it comes to talking about combustion.
If no test port is provided,A fuel filter adapter is needed, this adapter is connected to, or takes the place.
For example, an air/fuel ratio of 10:1 means that for every 10 pounds of air, 1 pound of fuel is burned in the combustion process.
That's how coastal chassis dyno went about calibrating the fuel pressure on johnson's ride, so a "zero-vacuum" setting (vacuum is eliminated at wide-open throttle) of 39 psi could be achieved.
Street-driven mustangs, the typical pressure settings are between 37 and 39 psi at idle, with the vacuum line disconnected.
Can replace a fuel pressure regulator with a few common tools at home in most vehicle models, those with systems with throttle body injection (tbi) or newer ones with electronic fuel injection (efi) systems.
Note: on some models like honda and nissan, you may need to disconnect the fuel hose from each end of the fuel pressure regulator before you can replace it.
Also, on some models like gm and ford, you'll replace the pressure regulator using a new kit.
On some models, you don't need to disconnect the return line, but unscrew the regulator mounting (two or three) bolts using an allen or hex wrench.
, when adjusting fuel pressure, the vacuum line that attaches to the small nipple on the regulator must be removed, and the nipple should be left open to the atmosphere while you adjust the fuel pressure.
Good fuel-pressure gauge and some dragstrip laps or a few quick rips up the street will help you get a solid baseline for setting fuel pressure, but the chassis dyno is the best way to determine the results of your up-or-down fuel-pressure adjustments.
How to replace a fuel pressure regulator at home whether you have a TBI or Multiport Fuel Injection system.
Everything has been cleared away from the throttle body, it has to be removed for better access to the fuel regulator.
Running inadequate fuel pressure-especially with power adders-can lead to detonation, blown head gaskets or worse.
The pressure regulator has one of the most important jobs in the system: control the amount of fuel pressure to each injector.
Just like any other component, fuel pressure regulators wear outthe spring may weaken, the diaphragm may allow fuel through, or some other internal or external component may stop doing its job.
Sense: the stoichiometric mixture is the point where there are exactly enough atoms of oxygen to burn 100 percent of the fuel, leaving no unburned hydrocarbons, which thus produces good emissions.
So a failed regulator can cause one of two things: it may increase fuel pressure beyond the required parameters and provide too much fuel to the engine, increasing emissions; or fail to maintain sufficient pressure and starve the engine, causing it to lose power, affect performance (misfire), make it hard to start or to not start at all.
Restore system pressure by turning the ignition key on for five seconds and then to the off position.
To test a fuel pumpstep by step instructions on how to check an automotive fuel pump and pressure.