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#1
05-29-2008, 10:12 AM
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114 250ce no start
hello, car is a UK model 1970 250CE with electronic fuel injection.
the car has been sitting for about 6 years, tried freshly charged battery, 20 litres of fresh fuel, cranks over but not getting any fuel to engine. Can't hear the fuel pump working. Checked the fuel pump relay fuses, and wiring where I could. Anyone got any suggestions? cheers...
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1993 320TE M104 --------------------------------------------------- past: 1983 230E W123 M102 1994 E300D S124 OM606 (x2) 1967 250SE W108 M129 1972 280se 3.5 W108 M116 1980 280SE W116 M110 1980 350SE W116 M116 1992 300E W124 M103 1994 E280 W124 M104 ---------------------------------------------- "music and women I cannot but give way to, whatever my business" -Pepys 
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#2
05-29-2008, 10:59 AM
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That engine has the same FI set up as your 280SE 3.5. You should hear the pump buzz for a second or two when you turn the key. If you can't then I suspect that either your fuel pump is gummed up or not getting any power. You can try jumping it to see if you can make it work.
If it's gummed up, it may be expensive to replace, I would suggest soaking it in parts cleaner to see if you can loosen it up. I miss my RHD 250CE.
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With best regards Al
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#3
05-30-2008, 07:59 AM
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hi, thanks for the reply... do you think it might also be the fuel pump relay(s)?
There seems to be 2 of these from what my Haynes manual says, mounted near the fuse box. I was thinking of bypassing them to see if a faulty relay is the problem but not sure which pins to use?
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1993 320TE M104 --------------------------------------------------- past: 1983 230E W123 M102 1994 E300D S124 OM606 (x2) 1967 250SE W108 M129 1972 280se 3.5 W108 M116 1980 280SE W116 M110 1980 350SE W116 M116 1992 300E W124 M103 1994 E280 W124 M104 ---------------------------------------------- "music and women I cannot but give way to, whatever my business" -Pepys
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#4
05-30-2008, 09:53 AM
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Before you bypass them check the circuit to see if they are engaging.
Pin #30 is the "hot" feed. It should be live at all times but may be interconnected. Pin #85 is ground or earth. Check for continuity. It also can be used as a "trigger" i.e, for the auxillary fan circuit which activates by the sender going to a "ground" condition when the engine reaches the proper temperature. Pin #86 is the "trigger" from the ignition. It should activate when the key is turned to the "run" position. It only triggers for a short time until it receives input from the control device. Pin #87 is the output to the device. To test the relay, make sure you have earth continuity to pin #85 and jumper a "hot" wire to pin #86. The relay should click and transmit power to pin #87.
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