Fuel Pump This section describes fuel pump modifications required in order to ensure that adequate fuel delivery occurs when the carburetor is operating under boost. Essentially this involves boost referencing the fuel pump so that its output fuel pressure rises with the boost pressure maintaining a constant difference between the fuel pressure of 2 to 5 psi above the boost pressure dependant upon the carburetion demands of the engine. The fuel pump modifications described are essentially the modifications made by McCulloch during their kit installations. However before covering these it is probably worth considering the fuel system modifications made by the factory installations of McCulloch superchargers by Kaiser, Ford and Studebaker. All three incidentally did not use a supplementary electric fuel pump in their installations, a practice that seems to have been restricted only to the McCulloch aftermarket installations. This was achieved by sealing the pump no external venting and then feeding the boost behind the fuel pump diaphragm in order to help the spring displace the diaphragm. The three valve design of the pump allowed for a greater fuel volume to be pumped. Boost referencing was also used in order to increase the pump output pressure in line with the boost pressure. Ford had two different fuel pump arrangements. This high pressure often caused roughness or flooding of the engine at low speeds and resulted in the service replacement of the diaphragm spring so that the pump produced 5 to 6.
Installing Fuel Pressure Gauge
Looking for more photos? Click to see bonus pictures for this project. I was planning on writing a technical article on the fuel pump replacement, but was unfortunately “forced” into it when the pump in my E36 3-Series died on us in Las Vegas last year. We spent all night trying to figure out why the car wasn’t starting, checking ignition, electrical components, etc.
Then we decided to check the fuel pump.
Jul 13, · On one of my MPI engines, when I hook up a fuel pressure gauge, I get a reading of about 30 PSI with the ignition switch on. Once I start the engine my pressure gauge goes all the way up 70 PSI and rapidly fluctuates between 70 and 80 PSI.
The following procedure is the result of me trying out my new test kit. In Ford switched from a return fuel system with a rail mounted fuel pressure regulator FPR to a returnless fuel system with a rail mounted fuel pressure damper and a tank installed FPR. Test Procedure for pre return fuel system 1. Locate the fuel pressure test port on the engine as identified in the photo below. With the engine ignition switch Off insert one end of the test kit fuel pressure hose into a container and connect the other end to the valve to relieve the existing pressure as shown below.
Remove the container and attach the gauge to the free end of the hose.
Seems like to much fuel with a Carter P4070
You can therefore see that, given a low-pressure 8-psi fuel system pushing against a 1g launch, there could easily be no fuel flow in the system during the time the car is experiencing that g force. Given that situation, the car must have at least an to psi system with sufficient volume to handle the incredible fuel-delivery demands. Most knowledgeable car builders take advantage of pressurized flow by placing the fuel pump at the rear of the car.
May 04, · The vacuum/boost referenced fuel pressure regulator varies the pressure while the engine is running, to maintain the delta pressure at the injectors. It relates to why fuel pressure regulators have a vacuum/boost reference hose, which maintains the specific injection rate.
Occasionally a diaphragm does fail. When this happens, you will experience fuel leaking out of the boost reference port. The compatibility issues we really only see in the diesel world. The problem is either on the feed side or the return side before or after the regulator. The harder you press your thumb down, the higher the pressure in the hose your fuel line gets before the water sprays out your return line. You either have a regulator that is undersized for your application or you have a restriction in the return line.
Our regulators come in a number of different configurations. The return seat size is more or less what decides how much fuel the regulator can bypass return. The return orifice of the regulator is simply too small to bypass enough fuel to keep the pressure down. If this is the case, you need to switch to a regulator that matches your flow needs. The other potential problem is a restriction in the return line usually the issue. Restrictions after the regulator are pretty much the same as an undersized regulator.
Many customers will try to re-use a factory line for the return line.
about aftermarket fuel rails
Residual pressure , normally 15 psi or so Otherwise your fuel lines will be empty on cold start resulting in long crank times. When you start an cold engine it needs to run a rich mixture so the pressure regulator bumps the fuel pressure up when cold,say 45 psi cold,35 on a warm engine basicly. If the fuel pressure regulator sticks and the system is at that 45 psi pressure when you shut the engine off it slams the check valve ball into its seat with more pressure than normal.
If i get a car with a bad fuel pump the first thing i do is pull the fuel pump relay and look at the terminals. If i see that the terminals are overly discolored due to heat then i always replace the fuel pressure regulator with the pump.
Order Fuel Pressure Regulators for your vehicle and pick it up in store—make your purchase, find a store near you, and get directions. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $+.
We recommend Internet Explorer set to x Schreurs Even we have a disclaimer. No revolution is complete without a secret handshake. The problem with doing lots of fuel-intensive mods on a fuel-injected car is that sooner or later you’ll hit the limits of what the computer can compensate without a physical upgrade to the system.
After dyno testing the visiting Mustang GT, we felt we had reached that limit. The engine seemed to be running lean. Too free up some more fuel, we decided to pony up to an adjustable fuel pressure regulator. And if you’re going to be fiddling with the fuel pressure, it helps to have a gauge. He sent an Aeromotive adjustable fuel pressure regulator B , all necessary fittings, and a custom-built steel braided fuel line. We got the gauge from AutoMeter , which required their mounting bracket Mounting the gauge will require some miscellaneous hardware from Home Depot Racer’s Supply.
For starters, have a friend set the gauge on its bracket and hold it on the cowl. Then sit in the drivers seat and have him move the gauge around till it’s where you like it.
Symptoms of a Bad or Failing Fuel Pressure Regulator
Get your Fuel Pressure Regulator changed by a top-rated mechanic at the convenience of your home or office. The fuel pressure regulator is an engine management component that is found in one form or another on virtually all internal combustion engines. Different engine operating conditions will require different amounts of fuel, which can be metered by changing the fuel pressure. Many fuel pressure regulators use vacuum operated mechanical diaphragms to change the pressure, though there are vehicles that are equipped with electronic fuel pressure regulators.
liter Vortec V6 truck engine. Dubbed Central Port Injection, or CPI, the The main injector and fuel pressure regulator on the CPI sys-tem are housed in a molded plas-tic piece with the six plastic tubes up , miles. Running for long periods against a restricted.
Saturday morning update, truck will not start this morning. Indy Monkey , When I turn the key on it goes to 58 lbs for 1 second, then goes down to 50lbs. I still cant find the fuel pressure regulator or get a definite answer that it is in the fuel tank with the pump. Indy Monkey The only code that was in the system is a bank 1 sensor 1 failure. No security lights in the dash are on. Tonight when I turn the key over it still spikes to 58, then stays at 50 when I crank the motor over.
After that it leaks down pretty quick.
Fuel System Loses Pressure
The existing In-Line Fuel Filter will be removed and discarded. A canister-type Fuel Filter will be added to the existing fuel reservoir on the frame rail behind the high pressure pump. The frame mounted fuel filter was repositioned to between the fuel pump and engine during model year production. This was incorporated in February, Fuel supply lines on 4.
Get the nice new adjustable fuel pressure regulator (AFPR from now on thanks). Prep it for installation as follows: This is the new Aeromotive piece, ready to go.
When the Check Engine Light comes on, either one of these codes, or both, may be found when a code reader or scan tool is plugged into the vehicle diagnostic connector. IF the vehicle is driven long enough, typically both codes will be set. A P lean code for bank 2 is the cylinder bank on the LEFT driver side of the engine on Ford vehicles with a transverse-mounted V6 engine and front-wheel drive.
This code is not set on four cylinder engines no bank 2. Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow because the EGR differential pressure sensor that monitors EGR flow is faulty and is under-reporting EGR flow. If the problem is not enough fuel, the underling cause may be a weak fuel pump, restricted fuel filter, leaky fuel pressure regulator or dirty fuel injectors.
A dirty MAF sensor can set a lean code. Cleaning or replacing the sensor should make the code go away. The MAF sensor is located in the air inlet tube just ahead of the throttle body. The MAF sensor should be protected from outside dust and debris by the air filter, but sometimes the air filter doesn’t fit real tight inside the housing and allows unfiltered air into the engine. Dirt can stick to the MAF sensor wire and form a coating that slows the response of the sensor to changes in airflow.
Mustang Adjustable Fuel Pressure Regulator – New Regulation
One of the best ways to retrofit fuel injection is to still take advantage of the research General Motors put into it and find a used factory system. Why should I swap to fuel injection? Swapping to fuel injection has many advantages. Your engine will last longer and have better low- and mid-range torque.
Nov 09, · Can anyone provide assistance on how to hook up a propane tank and regulator outside to use for gas logs? The company wants $ to rent and install the tank and regulator Status: Resolved.
It turns tighter and it’s much more stable at top speed! The widened sponson improves cornering, handling and high speed stability. Machined from billet aluminum and black anodized for corrosion resistance. Drive from turn to turn never worrying whether the trim is in the best position for perfect turn negotiation! The 5 degree positive angle lightens the nose of the craft and adds top speed; this is great for recreational use.
Both types are available in bore sizes of mm. Custom bore sizes from 80 to 90 available at no extra charge, specify size when ordering. The nozzle also offers 4 extra bosses that can be drilled and tapped for extra cooling fittings. Removing this restriction significantly reduces cavitation and improves holeshot and hook up with any prop type or diameter. Service turnaround time is days. These precision couplers are made from billet aircraft aluminum and CNC machined to exact tolerance.
The exclusive lightweight filter design couples to the OEM throttle body through a tuned built in velocity stack.
However I started to notice a drop off to about 22psi over about 15 to 20 seconds. It will eventually drop to the 0 over a while. During KOER it sits at about 32psi and holds steady. I know from past experience that a typical bleed-off should be nowhere near this quick and from reading some other forum posts on here some have attributed it to a possible leaky check valve, leaky injector or FPR fault.
Aug 21, · You need to hook up a fuel pressure gauge to the car and check your pressures to nail the problem. It could be any number of things but if it turns out to be a fuel pressure regulator sticking then expect your pump to be short for the war.
There are others as well. Automotive application for fuel pump: In order to replace the pump or strainer sock, you will have to completely remove the fuel pump assembly from the tank. The regulator and gauge sending unit can be accessed with only partial removal, but it is much easier to just take it out completely.
Besides, I highly recommend replacing the strainer sock if you are this far already. While you have the gas tank removed is a great opportunity to do some easy housekeeping and preventive maintenance to otherwise hard to access places. In a returnless fuel system such as this one, anything that gets past the filters will usually make its way to the end and stay there.
In this case, the relief valve and possibly the right side injector. Right and left references are as if you are sitting in the seat.