Additional check valve in csi fuel line

Stefan

Stefan

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I noticed a post (in bimmerforum) about putting an additional check valve in the forward fuel line to a CSi. In this way keeping the pressure to the injectors after the engine been turned off.

I wonder if all of you with D-jet have the same problem with pressure drop in fuel line after the engine been turned off? Even shortly after stop also need to do the "CSi starting method" by switching ignition on a few times to build up fuel pressure before cranking the engine?

Anyone here with the experience to add a check valve that might/should fix this annoying starting procedure?

Also, there are no "built in" check valves in fuel pump, filter or regulator as far as I know, so what could retain pressure normally in an original fuel line?
What did I miss?
 
Part number is 16 14 9 068 988 and cost about $9.00 from the dealer.

Your fuel pump does indeed have a check valve as does your fuel regulator.

With a fuel pressure gauge and a set of vice-grips you can determine which is leaking the fuel back to the tank and with TWO sets of vice grips you can tell if it is a leaky injector.
 
Thanks sfdon!

What I missed was to have a look in the D-jet manual! Of course is there a non return valve on the fuel pump at least. Sorry!

I did not get any hit on the part nr. Neither of RealOEM or the local dealer. Some digit not correct? By the way, what part do you refer to?

Surely, I still need to measure the pressure as described to determine were the leak is and how much.
 

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