Question 1

How do you remove a mechanical pump?

Accepted Answer

To remove a mechanical pump, start by detaching the cable from the negative battery terminal and removing the fuel tank filler cap to relieve fuel pressure. Then, wrap shop towels around the fuel pump inlet hose and outlet line fitting to absorb any spilled fuel. Detach the fuel inlet hose and outlet line fitting from the fuel pump, and unscrew the fuel pump mounting bolts to remove the pump and gasket. Scrape away any old gasket material from the fuel pump and engine block sealing surfaces. For models before 1988, the fuel tank needs to be removed. Relieve the fuel system pressure, detach the cable from the negative battery terminal, and raise the vehicle on jackstands. Disconnect the fuel vent, supply, and return hoses from the fuel pump/sending unit fittings, and detach the electrical harness connector. The fuel pump/sending unit assembly is located inside the fuel tank and is held in place by a cam lock ring mechanism. To unlock the assembly, turn the inner ring counterclockwise until the locking cams are free of the retaining tangs. Gently tap the rings loose if they are difficult to release. Extract the fuel pump/sending unit assembly from the fuel tank, being careful not to bump the fuel level float and sending unit. Inspect the condition of the gasket around the lockring mechanism and the inside of the tank. Clean the tank if sediment is present. If replacing the fuel pump, ensure you get the correct pump. To disassemble the pump, remove and discard the fuel pump inlet filter, detach the fuel pump wires, and remove the fuel pump outlet hose and clamp. Replace the hose if necessary. Remove the fuel pump top mounting bracket nut and remove the fuel pump. Reassemble the pump by installing a new inlet filter, placing the fuel pump top mounting bracket over the pump, and positioning the fuel pump in the lower bracket. Slide the stud of the top bracket through the hole in the fuel pump side bracket and tighten the top mounting nut. Install the fuel pump outlet hose and secure it with new clamps. Connect the wire terminals to the motor. To install the pump, insert the fuel pump/sending unit assembly into the fuel tank and turn the inner lock ring clockwise until the locking cams are fully engaged. Attach the cable to the negative battery terminal and start the engine, checking for any leaks.

Question 2

How to check fuel pump in Jeep Cherokee?

Accepted Answer

To perform a quick check on the mechanical pump in carburetor-equipped vehicles, first, disconnect the negative battery terminal, then remove the air cleaner assembly. Next, detach the fuel inlet fitting from the carburetor and place the inlet line end in a container. Reconnect the battery terminal and, if available, use a remote starter switch per manufacturer's instructions; if not, you'll need an assistant. Disable the ignition coil by detaching the primary lead wires, and with the fuel line directed into the container, have your assistant turn the ignition key to Start and crank the engine for about ten seconds. Observe well-defined spurts of fuel emission; if not, there's a fuel delivery issue. For a pressure test, employ a fuel pressure gauge, hose restrictor, and flexible hose, connecting them between the fuel inlet fitting or fuel filter and the carburetor. Start the engine, discharge fuel into a container briefly, close the restrictor, and note the pressure, which should be 4-to-5 psi for four-cylinder and 6-to-7.5 psi for V6 engines. If pressure is incorrect and fuel lines are fine, replace the pump. For a capacity test, operate the engine at idle, discharge fuel into a container for 30 seconds, and ensure at least one pint of fuel is discharged. If not, repeat with an auxiliary fuel supply and replace the fuel filter for four-cylinder engines if necessary. If volume is good, check the fuel supply line for blockage. V6 engines can undergo a direct connection vacuum test using a vacuum gauge, while an indirect connection vacuum test can be performed with a T-fitting. If vacuum isn't within specification, the pump is defective. On fuel-injected vehicles with electric pumps, perform a TBI pressure test by replacing the pressure test port plug with a special fitting, attaching a 0-to-30 psi fuel pressure gauge, and adjusting pressure with the regulator screw. For MPI pressure tests on earlier models, use a 0-to-60 psi gauge on the fuel rail and note pressure with and without vacuum to check the regulator. Later models require a special fixture. To test for fuel pressure leak down, use a gauge capable of reading 0-to-100 psi, start the engine, check pressure, shut down, and monitor pressure for 30 minutes; a drop of 0-to-20 psi is acceptable. If it exceeds, perform additional tests to identify the issue and replace the regulator or pump accordingly.

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