Quote:
Originally Posted by Graham
Martin,
The djet ECU uses the incoming air temperature along with the manifold pressure to calculate density of air. That along with engine rpm is used to calculate the amount of fuel to inject into the cylinders to achieve the required AFR.
Didn't understand the part about your fuel pump, but you do need a proper D-Jet pump, not a K-jet or an aftermarket type. And, it should put out at least 1L/30sec at discharge of Fuel Pressure Regulator. This ensures circulation of fuel back to tank at idle so vapour locking is less likely.
Interesting the 300SEL 4.5 doesn't have the vacuum switch over valve. Must have been something they introduced in 72. In your case, you would use A/C most of time, so why not disable the vacuum retard by disconnecting the tubing at distributor and plugging the tube? That's what the later M117s achieve by closing the valve.
I wish you luck.
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D-jet pump....upps
My current pump is a aftermarket CIS pump see picture.
There were controversial opinions about this pump when I installed it (my original pump (right side pump of second pic...the one with the 3 ports) was failing and I installed a rel. cheap CIS pump. It worked fine so far but I have now this trouble.
I also have the other pump (second picture left side) It might be from a 117 engine...not sure if d-jet or something else.
I could test and install this pump as an alternative to the CIS pump?
Another thing: I experienced a lot of vacuum when opening the fuel tank at gas station: Is this normal? Is something wrong here. ..However I have seen this for a longer time and never thought about it.
Martin