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Priming Party 200 1988

uid 27's pic
posted by  Art Benstein on  Sat Sep 14 17:12 CST 2019
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last visit: Fri Oct 17 20:10 CST 2014
[RELATED]

Hi Peter,

Can't say for sure the OP is mistaken because the individual car may have been modified, but as built, the LH2.0 and LH2.2 fuel system used in the 240 doesn't engage the fuel pumps until ignition pulses are present on pin 1 of their ECUs from the Hall-effect distributors.

The LH2.4 system revives the one-second key-on pump run which was first introduced with the K-jet's electronic relay as a by-product of its missing-pulse design. My guess is it was so handy as a troubleshooting tool, the firmware included it when LH2.4 was implemented. It certainly isn't necessary to prime the fuel rail, but for sure a bunch of folks believe so.
--
Art Benstein near Baltimore

Two secrets to keep your marriage brimming
1. Whenever you're wrong, admit it, 2. Whenever you're right, shut up.
-Patrick Murra





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