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Have to bridge the fpr to get any build up of pressure. The initial few seconds of pumping wont increase the pressure much above the 3 bar, fuel pump running continuously (fpr bridged) same 3 bar, which I assume is maintained by the accumulator when ignition is off. 3 bar seems to be the maximum...

Hi, good to see you are still on here. That is the manual I use, which is where I got the system pressure figs from. "M103 system pressure should be 5.3/5.5 bar" (around 75 psi) If I am reading test results correct in section 07.3-1603. of Model 124 Maintenance Manual

Tea break over! 1 year on and have finally got back to looking at the 300E. Fuel flow at return pipe with fpr bridged approx 1.5 litre / minute. Now able to check pressures in fuel system so with gauge straight onto fuel supply line pumps kick out over 9 bar (130+ psi) with fpr bridged. When...

Spark plugs were same as were in the car when I got it about 5yrs ago NGK BP6EFS had no problems with them on gas or LPG. Dizzy & rotor I'm pretty sure were Beru (had dodgy GSF parts before that which were rubbish) When it was running better there wasn't any tracking visible. The cps (part no...

I'm using an electronic copy of manual from a link posted on here IIRC. Mercedes Benz Model 124 - M103 Maintenance Manuals Only one cps on this old motor right at the back behind the oilfilter. Iddle valve very clean and instant movement when 12v across. Washed it through with carbclean anyway...

Thanks for the info - they are the only place that I do know of. Contacted them a couple of weeks ago and they had no space, waiting on price to get car transported to them should it prove necessary. Dave

Sorry I wasn't totally clear, the old fpr had a couple of dodgy looking solder joints and it was replaced to eliminate this as the cause. When the car is running again I will switch back to the re-soldered original to confirm it is functional and pack the new item away as a spare or resell it...

Have replaced with new - crank posn sensor, plugs, leads, distributor cap, rotor and coil a couple of months ago when I decided to put car back on the road. It had been sat on driveway for approx 1 year and had only been started occasionally. Car was running after these changes but with...

Update - with fuel pump running constantly car does not fire up. Fuel Pump relay in place car runs for a couple of seconds every time cranked. With the wiring plug disconnected from the cold start injector NOTHING. Would I be wrong to assume the car only runs briefly because the only fuel its...

Brand new fuel pump relay fitted. But made no difference. As the car runss for such a short time I cannot tell if the pumps re-energise so am going to try with the pins linked.

Thanks, Rev counter is def. working and shows engine picks up after cranking and runs up to about 1500 rpm before engine stops. Flywheel position sensor is new replaced this summer along with plugs, leads, dist cap, rotor and coil. Dave

Hi, trying to solve starting issue on my W124 M103 300e. Starts every crank but only runs for a couple of seconds. Fuel pumps both run and system primes no problem, but i am now wondering if the engine running signal is missing. How/where can I check for this. As the engine only runs for such a...