Skip the auto shop - Our mechanics make house calls

Q: I have a Mercedes 280 SL, 1985, WDB1070421A020760, many times it just stop while driving or at a stop. I have changed the fuel pump

asked by on

It stops while driving or at stop lights. I have changed fuel filtration, fuel pump, fuel pump relay, alternator and coil, but it still stops. Especially when I get on it from a standstill. When I turn the key off and back on it starts right up. The battery is good and is greater than 15 amps. What could be the problem?

My car has 252579 miles.
My car has a manual transmission.

Wow! A 280 SL with a manual gearbox is a rare machine indeed! It looks like you’ve eliminated a few of the prime suspects. The fuel pump relay would have been my first guess. But it looks like you’ve already been there.

One thing you haven’t mentioned that is a problem with the older MB’s is the fuel tank screen. Rust accumulating at the bottom of the tank can restrict the fuel flow to the pump and cause a drop in fuel pressure. when the car shuts off, the rust settles back off the screen so when you crank it back up, it can make enough pressure to restart.

Another big issue with the older cars is intake air leaks. As the rubber air hoses and boots get old and hard, they leak around the edges causing the fuel system to go lean. This can make it cut off when it’s idling, and it might make it stall when you first try to accelerate. Give the air hoses around the area of the intake a good look.

That car is equipped with the Bosch K jetronic injection system. A fuel pressure test is an important diagnostic procedure for a car that is stalling and requires a specific gauge and valve arrangement. I would have a local expert, like one from YourMechanic, inspect the stalling issue in person in order to have this properly corrected.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. I have a Mercedes 280 SL, 1985, WDB1070421A020760, many times it just stop while driving or at a stop. I have changed the fuel pump

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Steering wheel locked up

If it was security related the vehicle would not even start. The problem is likely the physical lock mechanism itself and/or the link with the ignition switch. This problem has been reported for this year, make and model before and...

Q: Engine stalling issue

Volkswagen has come under fire recently with several of their TDI diesel engines. Although these problems are related to engine emissions, it was also shown to cause intermittent stalling; as the computer would reduce fuel flow to create a very...

Q: Hesitation while accelerating and engine overheating on a '94 Toyota Corolla

The main problems this vehicle has for that problem are the spark plugs, distributor cap, and the wire set. On these older cars they are a one piece unit and just go bad. You will need to replace it. If...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...