See full version: MARINE FUEL PUMP
The Oshkosh Truck Corporation MK23 7 ton Cargo Truck is part of the Medium Tactical Vehicle Replacement (MTVR) family of trucks used by the US Marine Corps and Navy. The AMK23 is an MK23 with the MTVR Armor System (MAS) installed.
To improve the vehicle’s level of protection against mines and improvised explosive devices (IEDs), the MTVR Armor System (MAS) was designed as a permanent modification to the vehicle. It provides complete 360-degree protection as well as overhead and underbody protection for the cab occupants.
This vehicle carries the rooftop mounted Marine Corps Transparent Armored Gun Shield (MCTAGS). MCTAGS is compatible with various crew served weapon mounts such as the M2HB Machinegun, M240 Machinegun, and MK19 Grenade Launcher and provides protection from direct small arms fire and IED fragments. more
Here is a more detailed list of the 8 most common symptoms of a bad fuel pump.
One of the causes of black or white smoke is a defective fuel pump, making your engine get a rich fuel mixture. In most cases, a bad fuel pump is giving a lean mixture, so this is not a very common one. here
Fortunately, modern cars are loaded with sensors that can detect any number of problems as soon as they occur. One of these sensors is a fuel pressure sensor that is intelligently measuring the fuel pressure. If an irregularity is detected, the sensor sends a signal to the ECU, which lights up the check engine light. more
Vehicles that use a carburetor sometimes suffer from too much fuel pump pressure. This causes fuel to be pushed past the needle and seat assembly in the carburetor, which leads to flooding. The needle and seat work with the fuel bowl float in much the same way your toilet works. The fuel bowl fills with fuel. The float rises, and at a set point pushes the needle valve into the seat, cutting off the fuel flow. You can fix the problem by Installing a pressure regulator.
Place a hose clamp over each end of the fuel hose. Push the hose ends onto the fittings on the regulator. Be sure to note the flow direction indicated by an arrow on the regulator. The arrow points towards the carburetor. here
Install the proper size hose fittings in each end of the pressure regulator. They will be in the kit. more
The integrity or straightness of the aluminum surface can be checked with a small straight edge and a set of feeler gauges. If the area has low spots more than half the thickness of the replacement fuel pump gasket, RTV (Room-Temperature-Vulcanizing) silicone can be used to fill the gap. Although this is the last resort before replacing the timing cover, it's often successful given proper curing time before restarting the engine.
There are several best practices to follow when replacing the fuel pump or the sealing gasket. If the timing cover is made out of aluminum, for example, you should clean the sealing surface by hand without using abrasive materials. Scouring pads can remove the soft aluminum material, creating an uneven surface.
Where the fuel pump mounts to the timing case cover a gasket provides a tight seal. Although this gasket is usually reliable, engine vibration can cause the bolts to come loose. When this happens, oil can seep out around the fuel pump. If you notice a leak in this area, replace the seal as soon as possible, as detergents in the engine oil can cause further damage.
Most mechanical fuel pumps have a weep hole on the bottom of the unit. When the internal diaphragm leaks, fuel escapes through the weep hole to notify the vehicle owner of a malfunction. This is one of the more common fuel pump problems found in classic cars that are between 30 and 60 years old. here
On modern automobiles, the average fuel pump pressure is over 60 PSI (pounds per square inch). On classic cars with mechanical style fuel pumps, however, the pressure is much lower—between four and six PSI. If you suspect that your fuel pump is not producing enough pressure, there are two tests you can perform. The first is a simple pressure output test. Many inexpensive old-school vacuum testers can read mechanical fuel pump pressure just as well as vacuum pressure.
Another common place for a fuel leak to develop is in the rubber hose and metal tube that leads from the tank to the fuel pump. Since the metal tube is exposed to the elements, it's not uncommon for it to become rusted through to the point that the fuel is leaking out. Likewise, the rubber hose can also become worn out over time, leading to fuel leaks. If you notice that this component is damaged, replace it with a reinforced rubber fuel hose. [links]