Mercedes S55 Fuel Pump Relay Parts
Showing 6 out of 6 part(s) found in our catalog.
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The average price of a Mercedes S55 fuel pump relay is between $3.49 and $15.19.
Where Is The Mercedes S55 Fuel Pump Relay Located?
The Mercedes S55 fuel pump relay sits inside the main fuse and relay box. On most model years, you'll find this box in the trunk near the battery on the right side, tucked under the lining, or under the hood along the passenger side firewall. Open the cover and you’ll see a map—look for one labeled “fuel pump” or with a fuel symbol. Some covers may need a screwdriver or clip tool to remove. Putting relays back in their exact spots helps avoid confusion later; snapping a quick phone picture before pulling any out saves headaches. Tight spaces make it tricky, so a flashlight makes a big difference.
What Are The Symptoms Of A Bad Mercedes S55 Fuel Pump Relay?
If the Mercedes S55 fuel pump relay has failed, the engine will usually crank but not catch, with no fuel reaching the engine. Other issues may pop up, like starting, then stalling, losing power under load, or rough idle on hot starts. Sometimes, the car dies while driving, leaving you stranded. Clicking from the fuse box can sometimes be heard, or the relay itself may feel warm or smell burnt. Don’t guess and throw in a new pump—test the relay first. Relay issues can save a lot of money and time if caught early.
How Do You Test The Mercedes S55 Fuel Pump Relay?
To check your Mercedes S55 fuel pump relay, first pull it out of the fuse box. Inspect the pins for green corrosion or any black marks from arcing. Use a multimeter—look in your manual for which pins to check and what readings to expect. If you’re stuck, swap a matching relay from another slot that handles a non-essential system, then try starting the car again. No start with a known good relay means the culprit may lie elsewhere. Another trick is to bridge the power slots in the relay socket with a bit of wire to run the fuel pump, but this is only for quick tests—don’t leave it that way. Any sign of damage or no continuity means replace the relay.
How Much Does It Cost To Replace A Mercedes S55 Fuel Pump Relay?
Swapping out a Mercedes S55 fuel pump relay is not expensive by Mercedes standards. Most parts stores and online shops have them priced between $20 and $50. If a mechanic does it, expect $40 to $70 in labor, depending on your region. The whole job takes most people under half an hour. Many owners just pick up the part themselves and plug it in at home. Aftermarket relays from trusted brands work fine for most; spend extra on OEM only if you want factory parts.
Can A Faulty Mercedes S55 Fuel Pump Relay Cause Other Electrical Problems?
A dead Mercedes S55 fuel pump relay may sometimes affect more than fuel delivery. If the relay shorts out or melts, it might blow fuses or throw up error codes you haven’t seen before, especially in circuits that share power. Unusual electrical issues usually don’t show up unless melting or a wiring problem is present, but it’s smart to check any nearby fuses and connectors if a relay burns out. Fixing the relay usually puts everything right unless wire insulation has failed or fuse damage has happened too.
Why Buy Your Mercedes S55 Fuel Pump Relay From AutohausAZ?
AutohausAZ keeps it simple. Their prices on a Mercedes S55 fuel pump relay are low, and they don’t tack on surprise fees at checkout. Orders ship fast, and if a relay doesn’t fit, returns are hassle-free. Good support plus deep inventory makes finding the right part easy. That’s why so many Mercedes owners go back to AutohausAZ when they need another job done.
