Some German car owners have brought their vehicles to our shop after noticing low fuel pressure. This is especially common in certain VW and Audi models. We’ll explain the symptoms of low fuel pressure and why this occurs.
What Causes Low Fuel Pressure?
The cause for low pressure is premature wear in the camshaft follower. Subsequently, this causes damage to the drive lobe in the intake camshaft. The engine design includes a tappet or camshaft follower that rides between the intake camshaft and fuel pump shaft. Low pressure occurs when the constant friction from the pump shaft causes a hole to form on the camshaft follower.
Low fuel pressure is especially common in Audi and VW models with the 2.0-liter 4-cylinder engine. This engine is prevalent in the Audi A4, A6, S4, and S6. For Volkswagen, models with this engine include the Tiguan, Passat, Golf, and Jetta.
Signs of Low Fuel Pressure
The most obvious sign is the check engine light indicating low fuel pressure. You will also notice a significant decrease in acceleration. You may also notice black smoke coming out of the exhaust pipe instead of the usual white or gray fumes. Other symptoms include higher RPMs and frequent engine misfires.
You can solve most low fuel pressure problems by replacing the camshaft follower. Fortunately, this part is relatively inexpensive. Modern VW and Audi vehicles actually include a diamond-like coating (DLC) on the follower. This significantly reduces wear from constant friction. We can replace an old follower with a similar one with the new, high-quality DLC.
We Solve Low Fuel Pressure Problems
Camshaft Repair and Replacement
VW and Audi service in Bothell, Bellevue, Kirkland, Kenmore, Redmond & Woodinville