scotsditch
Member
I'm new to posting on this forum. I'm not sure if this is the right way to post. I also posted this on another thread, but this thread seems relevant. I have a 2003 vw jetta tdi. During a trip recently I filled it with renewable diesel. It ran fine for the rest of the trip, but after I got home and parked the car for a couple days it had trouble starting. It struggles to start like it has air in the lines. So I replaced the fuel filter and filled the new fuel filter with fuel injector cleaner. It started after holding the key over to start for 30 seconds or so. I took it for a quick 20 mile trip. I stopped filled the half empty tank to full with regular diesel. I parked the car for another day and the next day it wouldn't start. It struggled again like it had air in the lines. I had the battery tested, it was bad so I replaced it, but it still struggles the same. I replaced the p109 relay, it still struggles the same. Does anyone have any idea what the issue might be, and suggest how to fix it?