Here's a breakdown of what to check if you're having fuel pump issues:
* Check the Fuel Pump Relay: This is the most common and easiest thing to check first. Locate the fuel pump relay (your owner's manual or a repair manual will show you where it is located, usually in the underhood fuse box). Swap it with a relay of the same amperage rating from another circuit (if possible, and be cautious not to start anything that draws high current). If the problem resolves, replace the faulty relay.
* Check the Fuel Pump Fuse: Similar to the relay, check the fuse for the fuel pump circuit. Again, your owner's manual is your friend. Replace if blown.
* Check the Fuel Pump Inertia Switch: Many cars of this era have an inertia switch, a safety device that cuts power to the fuel pump in a collision. Locate this switch (often under the dash or in the engine compartment) and check if it's tripped. Press it to reset it if necessary.
* Check Fuel Pressure: This requires a fuel pressure gauge. Low or no fuel pressure indicates a problem with the fuel pump, fuel filter, or other components in the fuel delivery system.
* Check for Power at the Fuel Pump: Use a test light or multimeter to verify if the fuel pump is receiving power when the ignition is turned on. This checks the wiring.
* Consider the PCM: While less likely than the other issues, a faulty PCM can prevent the fuel pump from working. This is usually diagnosed by a professional mechanic using a scan tool.
Important Note: Working with fuel systems involves flammable liquids. Always exercise caution when working around fuel lines, the tank, and components. Disconnect the negative battery terminal before performing any repairs.
If you're not comfortable performing these checks yourself, take your 1990 Chrysler Fifth Avenue to a qualified mechanic for diagnosis and repair. Attempting complex repairs without the proper knowledge and tools can be dangerous.
