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MECHANICALS With a 30 year-old automobile, there will always be discussion here - maintenance, modifications and mechanicals.

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Old 1st August 2012, 09:03 PM
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Oversize Oversize is offline
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Default Fuel pump safety cutout

I believe the W116 fuel pumps should not run unless the engine is turning over. And that this was a safety measure should the vehicle become involved in a collision. However this feature does make it difficult to determine if the pump is working in the event of a fail to fire, as you can't hear it running over the noise of the starter.

The pump on Red Bull can be heard running with the just the ignition switched on and I believe it was modified to make diagnosis easier. Could anyone guess what's been bi-passed to achieve this? I'd like to return it to the standard system...
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01 Ford AU 5L (Deep Blue)
89 560L#322020
88 500L#451660-P
88 420L#422477-P
87 420L#324309-P
87 420L#-P
88 420L Euro#-P
88 420L#-P
86 560L#235896-P
79 6.9#5541 (Red Bull)
78 6.9#4248 (Skye)
79 6.9#3686 (Moby Dick)
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Old 2nd August 2012, 07:46 AM
Helmet Helmet is offline
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Default Re: Fuel pump safety cutout

Some versions of K jet had a switch on the air intake sensor plate that switched the fuel pump when the plate moves down (when air flowed over). If the plug is disconnected the pump runs all the time. On later models they used an ignition signal sensing fuel pump relay.

My guess yours has the plug off the air flow sensor
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Old 8th August 2012, 07:43 PM
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Tony66_au Tony66_au is offline
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Default Re: Fuel pump safety cutout

Might have to check for the plug on the SE, its a 77 model and would make the initial diag much easier although i suspect the tank will have to come out for a clean and in tank filter.

Bloody LPG causes so much neglect
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Old 8th August 2012, 07:45 PM
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Default Re: Fuel pump safety cutout

BTW the issue is wont run on fuel under 2000 rpm, over that no probs but under that and its gone, cant even feather the throttle to get it back.

Car was run on LPG for years
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Old 22nd August 2014, 11:50 AM
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Default Re: Fuel pump safety cutout

Is it possible Red Bull has a different relay and that's why the pump is running as soon as the ignition is on?
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Mark

01 Ford AU 5L (Deep Blue)
89 560L#322020
88 500L#451660-P
88 420L#422477-P
87 420L#324309-P
87 420L#-P
88 420L Euro#-P
88 420L#-P
86 560L#235896-P
79 6.9#5541 (Red Bull)
78 6.9#4248 (Skye)
79 6.9#3686 (Moby Dick)
78 6.9#1776 (Dora)
77 450L#067010-P
75 450L#028414 (Gold Nugget)-P
57 Buick 73A (Titanic)
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Old 22nd August 2014, 03:34 PM
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SEL_69L SEL_69L is offline
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Default Re: Fuel pump safety cutout

Try to start the car in gear, or in reverse.
I won't start the engine of course, BUT the fuel delivery pump should get an electrical supply, and thus you should hear it, albeit faintly.
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