How do you test a Mercedes fuel pump relay?

How to test a fuel pump relay

  1. Park the car in safe and level ground.
  2. Step 2: Turn the ignition key in the ON position but don’t start the car.
  3. Step 3: Raise the hood and locate the fuel pump relay.
  4. Step 4: The fuel pump relay will emit a clicking or buzzing sound when turning the key in the ON position.

Will fuel pump prime if relay is bad?

If the relay fails, the oil pressure switch can power the pump once the starter spins the engine long enough to build a bit of pressure. If you can hear the pump run for a few seconds when you first turn the key, then the relay is OK.

Can AutoZone test a fuel pump relay?

AutoZone makes checking fuel pressure easier than ever. While testing does entail some work, few things are more rewarding than successfully troubleshooting your fuel pump relay. And with a fuel pressure test gauge from AutoZone, it’s easy.

Can you bypass a fuel pump relay?

Jumpering or bypassing the fuel pump relay puts a constant +12VDC to the fuel pump. Basically you have voltage directly from the battery to the fuel pump, even with the engine turned off. You could use a jumper assembly with a toggle switch to manually turn on and turn off the fuel pump.

Can AutoZone check a relay?

A relay can be checked with a jump cable, a voltimeter, an ohmimeter or a test light. If the terminals are accessible and the relay is not controlled by a computer, the fastest method will be a jump cable and a test light.

How much is the fuel pump relay?

The average cost for fuel pump relay replacement is between $59 and $67. Labor costs are estimated between $31 and $39 while parts are priced at $28.

Is there a fuel pump relay in a Mercedes 280 SL?

Mercedes R107 280SL fuel pump relay – YouTube This video shows how to locate and repair the fuel pump relay in a 1983 280 SL. The video also touches on the fuel pump relays and fuses in earlier SL’s incl… This video shows how to locate and repair the fuel pump relay in a 1983 280 SL.

Are there any problems with the 1985 Mercedes 380SL?

The ’85 380SL had Bosch Platinum spark plugs–replaced them with NGKs. Intake, timing, and flow have all been monitored–no apparent problems. The diaphrgam and its “control arm” (if you will) sometimes get sticky/stiff…but not consistently. Fuel pump and fuel pump relay have been changed.

How often does Grandma drive her Mercedes 380SL?

Grandma literally drove it once a week to the beauty shop for 20 years–has never even taken the top off. Grandson drove it around town and on the highway, and had TONS of things done to make up for the sludge of it sitting/running at low speeds for all those years.

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