Skip the auto shop - Our mechanics make house calls

Q: Crank but not start

asked by on

When I tried to change my fuel filter the other day it wasn't successful. After I tightened the filter and tried to start my car it would crank, but not start unless I pressed on the gas pedal. Then I tightened the bolt as much as possible and the same thing happened. Could there be air in my fuel filter lines that need to be bled out? Do you have any ideas?

Thanks for writing in about your 1990 Mercedes Benz E300. It sounds like the idle valve may be stuck closed and this could be why the engine only starts when the gas pedal is pressed. Due to the pressures generated by the fuel system for injector operation, fuel system air is generally quickly purged when the vehicle is first started.

The fuel system should be checked for leaks and the idle valve checked for free movement of the valve. You may want to enlist the help of a mechanic, such as one from YourMechanic, who will have the tools and equipment to access the fuel system and can diagnose and correct the no start issue for you.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Crank but not start

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: Ignition locked up after the car sat for two months

You may be experiencing a faulty ignition lock cylinder. This is the part that is responsible for locking the steering wheel and the ignition switch without the key in the ignition. If this part fails, the key may not turn,...

Q: Found one black pipe detached when I opened the hood.

Hi there. The black pipe on your engine is the air intake tube. There are two different tubes. On tube goes to the air box where the engine air filter sits in. The other tube goes to a resonating chamber...

Q: Car electrical issues

The dash light may need to be replaced again. The light would need to be checked for a bad socket. The sunroof will need tested to see if the track is binding. The issue with your radio only working if...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.