Mercedes R500 Fuel Pump Relay Parts
Showing 6 out of 6 part(s) found in our catalog.
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The average cost of a Mercedes R500 fuel pump relay is between $3.49 and $15.19.
Where Is The Mercedes R500 Fuel Pump Relay Located?
Finding the Mercedes R500 fuel pump relay often turns into a hunt. Open the trunk and lift the carpet on the right. There’s a panel tucked behind the liner. The fuse box sits there, a cluster of fuses, relays, and labels. Flip the lid and you’ll see an outline chart—nothing fancy, just functional. Scan for "fuel pump relay" or look for a relay labeled K27 or similar. Mercedes doesn’t make it obvious, so keep your owner’s manual close. Sometimes those relays blend together and you’ll want certainty before swapping anything out.
What Are Common Signs Of A Bad Mercedes R500 Fuel Pump Relay?
You turn the key and get nothing but the sound of the starter—no rumble, no life. That’s a classic sign the Mercedes R500 fuel pump relay may have checked out. Some cars tease you with a quick start followed by a stall, as if the engine changes its mind. The fuel pump stays silent when you turn the ignition, breaking the normal hum you expect. A sudden loss of power while cruising? That’s another sign. Intermittent issues—off and on, unpredictable—also raise suspicion. When the relay fails, problems hit fast.
How Do You Test The Mercedes R500 Fuel Pump Relay?
Grab a multimeter and some patience. Pull the Mercedes R500 fuel pump relay from its spot. Check resistance across the pins—should match the relay specs. Hit the control side with battery power. Wait for a click, a tiny snap. If it stays silent or the resistance readings don't budge, the relay’s likely toast. In a pinch, swap it with another identical relay from the fuse box. If your fuel pump wakes up, you’ve found the problem. Testing doesn’t take long but demands attention. One loose pin and you’re chasing an electrical ghost.
How Much Does It Cost To Replace The Mercedes R500 Fuel Pump Relay?
A new Mercedes R500 fuel pump relay isn’t going to bust your wallet. Figure $25 to $60 for the part if you shop around. Most auto part stores carry it, some offer next-day delivery. Swap it yourself and your only investment is time and a screwdriver. Mechanic shops might tack on $75 for labor, higher in big cities. Total cost usually lands under $120. There are pricier jobs on a Mercedes—this isn't one of them.
Can A Bad Mercedes R500 Fuel Pump Relay Cause Other Issues?
A dead relay does more than stall your engine. Repeated failed starts stress your battery and put extra wear on the starter. Those clicks you hear mean current is flowing, even if nothing’s turning over. Rare, but possible—a faulty relay with an internal short can throw error codes or melt a fuse. Electrical gremlins pop up in the strangest places. Fix the relay first. A $40 part today might save you from tracing wires later.
Where Can You Find An Affordable Mercedes R500 Fuel Pump Relay?
AutohausAZ makes it easy to get a Mercedes R500 fuel pump relay fast. Prices stay reasonable, no markups or gimmicks. Shipping moves quick, so your R500 won't sit idle. The returns process keeps things simple if the part doesn’t fit. You won’t find high prices or hidden hassles here—just what you need, when you need it, without the runaround.
