In order to void any electrical hazards, the first step in installing a fuel pump is to disconnect the negative battery terminal. It can avoid expensive repairs, ranging between $500-1,000 per accident just from this one step. After that the fuel tank has to be drained of a 12-18 gallon gasoline (most cars, trucks, and SUVs) which are all potential fire hazards due to gravity. It can be a 1- to 2-hour job for removing the fuel tank, according to your car size and car design. In other words, it's sometimes easier to access the fuel tank of a compact car like the Mazda3 than a larger SUV like the Ford Explorer.
With the fuel tank off, you can simply disconnect the fuel lines and electrical connectors to remove the old fuel pump. These connectors are typically held in place with clips or fasteners, and it is important to be gentle when getting them off so you do not break the lines which would be another $100-200 for a replacement. Mounting the new fuel pump requires carefully positioning the pump in the tank, while correctly locating the fuel filter and strainer so they won't clog. Under the wrong circumstances, a filter that was not properly installed has the possibility of cutting off fuel flow by up to 30%, affecting engine performance.
Proper torque when tightening the bolts on the pump assembly is important. Typically, most fuel pump retaining bolts need 15-30 ft-lbs of torque (depending on your vehicle's make and model.) If screwed down too tight it can damage the assembly and if not tighten enough, that will cause a leak creating an interruption in the fuel supply. Then it leaks by, and fuel pressure is lost, which is directly relate to a very poignant loss of engine power —around 10-15% less performance.
Reconnecting the fuel lines and electrical connectors after installing the pump ensures that fuel is able to flow properly. The next step is to install the fuel tank back into place, something that's a bit technically tricky due to its size—it can weigh up to 100-150 lbs when full. Aligning the tank properly also reduces stress on fuel lines and wiring, eliminating potential pump failure down the line. Improperly secured tanks can decrease the lifespan of fuel pump on average between 20-30 per cent.
With the fuel pump in place, switching on the ignition (without starting the engine) is sufficient to pressurize the system to around 40-60 psi for modern fuel-injected engines. This is critical for checking for leaks and that the fuel system is working properly before firing up the engine. Failure to check this could result in expensive repair when the fuel line buts up properly and starts leaking fuel at 0.5-1 liter per minute.
Adequate Selection Of Fuel Pump Is Important In High-Performance Vehicles To Provide Suitable Power Output For Engine. And if you're making 750 hp, this Walbro 450 LPH fuel pump permits running a sump half full of E85 to maintain fuel delivery and power levels. By comparison, a typical OEM pump in the 200-300 LPH delivery range is capable of supporting only as much as 400 horsepower, which isn't exactly sufficient for beefy modified engines.
Fuel pump replacement may be expensive, although prices differ depending on the type of vehicle. Usually a replacement with labor and parts, runs $ 400-900 depending on the pump and complexity of the vehicle. You can spend upwards of $450 for high-performance pumps, while you generally see OEM pumps between $150-300. Where you going to get killed on this is labor, which will typically run $200 to $300 by my experience but it varies greatly depending on how easy or hard the fuel tank is to reach — some cars need half the car taken apart.
Click on the link Fuel Pumpto know more about choosing and installing the right Fuel Pump so your fuel system can work at optimal efficiency.