T4 2.0L Stalling Issues Point to Fuel Regulator Fix

As someone with moderate experience in car maintenance, I encountered almost identical symptoms with my T5 2.0L from 2019. The problems you describe match exactly what I experienced, particularly the stalling and power loss issues. Initially, I also thought it was the fuel volume regulator, but after diagnostic testing, it turned out to be a defective high pressure fuel pump. The symptoms can be quite similar, making accurate diagnosis crucial for proper fuel injection system repair. The repair process involved: 1. Complete diagnostic scan 2. Fuel pressure testing 3. Replacement of the high pressure pump 4. System reprogramming 5. Final testing to ensure proper fuel efficiency Total cost was 1510€, including parts and labor. The repair completely resolved the issues and restored normal engine performance and fuel economy. Before proceeding with any repairs, you should have the following checked: Fuel pressure readings, Car sensors data, Error codes from engine management system, Fuel consumption patterns Could you share: Build year of your T4, Current mileage, Any recent car maintenance work, When the symptoms first appeared, Whether fuel consumption has increased This information would help provide more specific guidance for your situation.

Had my last service at 36658km and the technician suggested my car maintenance schedule was up to date. After trying the suggestions for my T4 issue, I tested fuel pressure and got very low readings, around 2.1 bar at idle. Also noticed the engine misfire gets worse when accelerating. The check engine light codes point to fuel delivery problems. These symptoms started appearing gradually over the last 2 weeks. The automotive repair manual suggests checking the fuel pump relay first. Would it make sense to start there before replacing more expensive components?

Thanks for the additional details. Like my T5, your low fuel pressure readings strongly suggest a fuel delivery issue, but the fuel pump relay is definitely a smart first check, much cheaper than replacing the entire pump like I had to. Based on the gradual onset and pressure readings, here are a few key points to consider: 1. The fuel pump relay is a common failure point affecting fuel pressure. Testing it costs minimal time and parts (usually under 50€) 2. Your 2.1 bar reading matches what I saw before my fuel pump failed. Normal pressure should be around 3.5-4 bar at idle for our engine type 3. The misfiring during acceleration further supports a fuel delivery problem, when the engine demands more fuel, the weakened system cant keep up My suggestion would be: Test the relay first, Check fuel pressure again after relay replacement, If pressure is still low, then investigate the pump like in my case One thing I learned from my repair, modern fuel injection systems are quite sensitive to pressure fluctuations. When the high pressure pump started failing on my T5, it showed almost identical symptoms to yours. Would you be able to check if your fuel consumption has increased recently? This was another tell-tale sign in my case before the full repair was needed.

Thanks for the helpful suggestions about checking the fuel pump relay first. I just checked my fuel records and noticed consumption has increased by about 15% in the past month, definitely not normal. The rough idling and engine misfire are getting more noticeable too. I managed to source a relay for 35€ and will try replacing that this weekend. Makes sense to start with the simplest fix first. The car sensors are showing consistent fuel pressure drops now, especially during acceleration. If the relay swap doesnt resolve it, I will probably need to look at the high pressure pump replacement you mentioned. Will the car be safe to drive in this condition until the weekend? I can manage with the reduced power but want to avoid causing any additional engine damage. Good to know the symptoms matched your experience so closely, helps confirm I am on the right track with the diagnosis.

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