How can you test a fuel pump relay?
The easiest way to test a suspect fuel pump relay is to; swap the suspect relay with a good one. You may find another relay in your car with the same configuration as your fuel pump relay. Just make sure the other relay has the same configuration. Remove the suspect relay and install the good relay and check if your engine fires up.
What does it mean when there is no pressure on the fuel pump?
If the test light illuminates but there is no pressure, it means the pump is faulty. When the engine runs, the pressure will drop to 52 psi. If you snap the throttle, the pressure will increase by 5 psi; this indicates the pressure regulator functions well without any issue.
Is the fuel pump relay controlled by the PCM?
Consequently, the fuel pump relay is usually controlled by, the ignition or powertrain control module (PCM). As a result, when switched on, the fuel pump relay; will provide current to the fuel pump, so that it may function. Therefore, any faults with it, can cause fuel pump issues.
What does a test light on a fuel pump do?
Consequently, It acts as the “switch” that connects electrical current, from one terminal to the other. Use Jumper wires to supply 12v power to terminals 86 and 85. Next, use a test light on terminals 87 and 30, to see if you have power. Finally, if the test light goes on the the problem lies somewhere else.
Why does my Mercedes 560sl have trouble starting?
A 1988 Mercedes 560SL has trouble starting despite efforts to crank the engine. Could the fuel filter or pump be responsible for this? Check the fuel pumps to see if they are working alright.
What kind of engine does the Mercedes 560sl have?
Questions about Mercedes 560SL Issues on JustAnswer The Mercedes 560SL is part of the popular 107 SL line of sporty coupes and convertibles that came out from 1971 to 1989. It was fitted with an overhead camshaft 5.6-liter V8 engine that used Bosch fuel injection and produced 238 horsepower and 287 foot-pounds of torque.
Why is my fuel pump not working properly?
If the pumps are operational and the tank has fuel in it, the problem might lie with the ignition and have to do with either the crankshaft sensor, ignition module/coil or the cap and rotor. In case the pumps are not working properly, the problem could be caused by a faulty fuel pump relay.