VW Transporter Fuel System Failure Symptoms & Fixes

Having experienced nearly identical symptoms with my 1999 VW Golf (gasoline engine), the automotive diagnosis pointed to a failing fuel delivery system. The rough running and stalling during idle are classic signs of inconsistent fuel pressure. During auto repair, the mechanic found two issues: a deteriorated fuel pump wiring harness and corroded electrical connections at the pump assembly. The engine stalling problems initially made me suspect a complete pump failure, but the root cause was the compromised electrical connection. The repair involved replacing the entire wiring harness and cleaning the connector assembly. This was a serious repair that required dropping the fuel tank. However, it was less costly than replacing the complete fuel pump unit. For your Transporter symptoms, I recommend having a fuel pressure test performed first. A proper automotive diagnosis will determine if the issue is electrical or mechanical. The symptoms perfectly match a fuel delivery problem, rather than a sensor or computer issue. Based on the age of your vehicle, checking the wiring and connections should be the first step before replacing expensive components.

Thanks for sharing your Golf experience. Your fuel system problems sound really similar to what I am dealing with on my Transporter. The fuel pressure test is definitely a good starting point before jumping into major repairs. Did you happen to remember the total cost for fixing the wiring harness and connectors? Also curious if you have had any fuel injector or pump issues since getting it repaired? Just want to know if I should expect any related problems down the road during my auto repair journey.

After getting the issue properly diagnosed, the repair turned out much simpler and cheaper than expected. The car mechanics found the problem was just a loose connector at the fuel pump assembly, not the complete wiring harness as initially suspected. The total repair cost was 95€, which included cleaning and securing the electrical connection. The gasoline delivery system has worked flawlessly since the fix, no more stalling, rough running, or car performance issues. The fuel pump and fuel injectors are functioning perfectly after resolving that electrical connection problem. This repair was done 8 months ago, and I have not experienced any related fuel system problems. This confirms why proper diagnosis is so important before replacing major components. What seemed like a failing fuel pump was just a basic electrical issue. Getting this fixed early likely prevented damage to other fuel system parts. Based on the similarities with your Transporter symptoms, having the connections checked first could save you significant repair costs before considering full pump replacement.

I took my Transporter to a trusted mechanic yesterday after reading your helpful advice about checking the electrical connections first. The fuel pressure test revealed exactly what you described, a faulty connection at the fuel pump assembly causing irregular gasoline delivery. The auto repair was straightforward and cost effective at 120€, covering the diagnostic testing and fixing the loose wiring. The mechanic also cleaned the fuel injectors while they had access, which helped restore normal car performance. The difference is incredible, no more stalling, smoother idle, and the check engine light is off. The fuel pump is working properly now that it has a solid electrical connection. Really glad I got a second opinion instead of replacing expensive parts unnecessarily. Just wanted to update and thank you for steering me toward the simpler solution. The symptoms were stressful but the fix was much easier than expected.