At what point in time do the fuel pomps come on?If i turn the key to the last stop before [start]the pumps are not on.Is this normal? The problem i am having is it takes too long to start when cold.I replaced the fuel pump valves about two months ago.This problem started last month after replacing all of the fuel injectors. It seems like it is not holding the proper amount of fuel preasure.

The fuel accumulator could be at fault. My understanding is that it maintains fuel pressure, as the fuel evaporates, when the engine is hot. But I imagine, it also helps in a cold start.

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1989 420 SEL

When do the pumps come on? How can i check if the accumulator is at fault?

I thought the [fuel pressure regulator]next to the distributor regulated the pressure.

The pressure regulator near the FD does regulate the fuel pressure to the FD. But you need to get fuel to the regulator from the tank, when the pumps are off, as the fuel evaporates in a hot FD. That's why you need a fuel accummulator (FA), it accumulates fuel and holds it under pressure, when the pumps are off, it pushes the fuel to the regulator, then onto the FD.


You may also have a leak in one of your fuel lines. I had one line rust through and leak.

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1989 420 SEL

Thanks for the info.I would like to know how to check it,since it is costly.