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Should fuel pump run with switch in 'on' position before cranking? 700 1988

uid 18083's pic
posted by  lucid on  Mon Jan 12 05:14 CST 2004
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last visit: Fri Oct 24 12:31 CST 2014
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Chris,

I think your pumps run with Key ON because they are '91s, and probably have the LH 2.4 FI. Erwin's '88 is probably LH 2.2.

I have no real proof on this, but in my own experience, no LH 2.2 does it*—while the '93 940 does. And I've seen it on one '89 240 (LH 2.4)

* The exceptions are when the engine stops with the Hall Sensor in just the right place to furnish a brief pulse with power ON. This allows the pumps to run for a second. But it's not a design feature, as I believe the LH 2.4 to have.

P.S. I also think the Check Valve's been getting a bad rap. The spec is that it mustn't drop below 14.5psi (more then half) in 20 minutes. What can you expect in the morning?

I believe it's more to help on repeat starts during routine usage. This is borne out by the fact that it's purpose (in maintaing some pressure) is described as being for "quicker restarts and preventing vapor lock" (Bosch FI manual).


Just my observations,

Bruce

--
Bruce Young,
'93 940-NA (current)
'80 GLE V8 (Sold 5/03)
'83 Turbo 245
'76 244 (lasted only 255,000 miles)
73 142 (98K)
'71 144 (track modified--crusher bound)
New 144 from '67 to '78
Used '62 122 from '63 to '67






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