Skip the auto shop - Our mechanics make house calls

Q: Fuel is not returning to the tank and there is too much pressure on the feeding line.

asked by on

Fuel is not returning to the tank and there is too much pressure on the feeding line. Got a 99 VW Polo which uses the MP9 fuel injection system, the car won't start it only start when I kick start it even though the starter swing well. Check the fuel lines, the fuel is pumped up to the intake but nothing is coming out of the return line to the tank, I replaced the fuel pressure regulator and it worked for a couple of hours and went back to the issue again. I'm thinking that the fuel is not getting into the injectors, would like to know what would cause the fuel not to return to the tank when it goes to the engine. I also have a new fuel pump and battery.

The only things that are likely to cause fuel not to return are either a failed fuel pressure regulator, or an obstruction in the fuel rail. Even though you recently replaced the fuel pressure regulator, my guess is that it’s the cause. It’s not impossible for new parts to fail, especially if they were not of original equipment (OE) quality. I would suggest getting a new fuel pressure regulator from the dealership, and put that part in to see if it makes a difference. If it doesn’t, then you will need to have a qualified professional, such as one from YourMechanic, inspect the fuel system and diagnose the cause of the no start condition.

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
  • Home
  • Questions
  • Fuel is not returning to the tank and there is too much pressure on the feeding line.

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: 09 jetta bangs and jerks when shifting from park to drive or reverse when cold or first started. Jerks during gear shifts wen cold

Hi there. When a car jerks or bangs when it's running, it's typically the result of an engine misfire or exhaust of vacuum leak. In many cases, this could also be due to ignition system components, wires or connections being...

Q: Car makes chirping noise on startup

When you hear the noise, it may be a belt noise or a starter noise. The starter's on these engines have a problem with a gear reduction squeal during the engine's start up. To fix the issue the starter would...

Q: My 2002 Dodge Ram 1500 will not start

In your vehicle, the powertrain control module (PCM) receives input from the coolant temperature sensor. It then uses this information to determine control of various outputs such as the fuel injectors and ignition timing. It also relays this information to...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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.