Bunnyboy
Member
Any words of wisdom on where to start?
My Vito 638 112CDi 2002 has developed a problem starting some mornings. Starts fine once been running.
The fuel filter has an air bubble that appears in one of the lines after a few minutes of engine stop and slowly grows. The filter has three pipes at the top and its the far left looking from the front of vehicle which I believe brings fuel from the tank.
Cannot see fuel in the clear pipes when engine running.
Taken to the Merc dealer and they changed fuel filter thinking they had solved the problem. Unfortunately it hasn't, possibly slightly worse.
My question where to logically start.
Purchased O rings to replace seals at ends of fuel lines. Common problem with this engine but some hard to reach.
Purchased T valve top of fuel filter that I think has something to do with heated fuel.
Bit apprehensive to change O rings and T valve in case of introducing too much air into system and not being able to start again. Is a priming pump required before even attempting?
Other possibilities that could be cause as far as I can deduce are:
injector leak of pipes and their clips
Water drain valve on fuel filter, but assume new one with filter.
Water sensor O rings. Mercs didn't appear to put on any new seal when replacing filter unless supplied with filter.
Fuel pressure regulator seals. Believe this normally would cause problem starting when warm if gone.
Booked back in with Mercs in New Year but would like to have solved or at least have a logical (less expensive) route to solve issue.
My Vito 638 112CDi 2002 has developed a problem starting some mornings. Starts fine once been running.
The fuel filter has an air bubble that appears in one of the lines after a few minutes of engine stop and slowly grows. The filter has three pipes at the top and its the far left looking from the front of vehicle which I believe brings fuel from the tank.
Cannot see fuel in the clear pipes when engine running.
Taken to the Merc dealer and they changed fuel filter thinking they had solved the problem. Unfortunately it hasn't, possibly slightly worse.
My question where to logically start.
Purchased O rings to replace seals at ends of fuel lines. Common problem with this engine but some hard to reach.
Purchased T valve top of fuel filter that I think has something to do with heated fuel.
Bit apprehensive to change O rings and T valve in case of introducing too much air into system and not being able to start again. Is a priming pump required before even attempting?
Other possibilities that could be cause as far as I can deduce are:
injector leak of pipes and their clips
Water drain valve on fuel filter, but assume new one with filter.
Water sensor O rings. Mercs didn't appear to put on any new seal when replacing filter unless supplied with filter.
Fuel pressure regulator seals. Believe this normally would cause problem starting when warm if gone.
Booked back in with Mercs in New Year but would like to have solved or at least have a logical (less expensive) route to solve issue.