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Old 08-08-2017, 09:25 PM   #1
dobber13
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Default Fuel pump operation

Why didn't Volvo make the fuel pumps come on when key is in the start position instead of the on position? I would think that priming the fuel system before starting would make for quicker starts. Can this be changed on a 85 B21ft?
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Old 08-08-2017, 09:46 PM   #2
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1 don't mess with things that work
2 think twice when you are confident you are going to outdo the Volvo engineers
3 better is the enemy of good
4 how do you get the key to start without going through "on"?
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Old 08-08-2017, 11:25 PM   #3
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It's a safety thing - you don't want the fuel pump running when the engine is stopped. For instance, after an accident you don't want to pump extra fuel onto any fire, or puddle on the ground.

K-Jet uses the distributor (actually the coil) to detect cranking/running. This energizes the fuel pump relay as long as the cranking/running continues.
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Old 08-08-2017, 11:47 PM   #4
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They do prime in KP2 on my lh2.4 cars.
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Old 08-09-2017, 12:33 AM   #5
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Originally Posted by dobber13 View Post
Why didn't Volvo make the fuel pumps come on when key is in the start position instead of the on position? I would think that priming the fuel system before starting would make for quicker starts. Can this be changed on a 85 B21ft?
What position is "start"?
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Old 08-09-2017, 03:40 AM   #6
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The one when the starter sings its whiny song.
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Old 08-09-2017, 05:16 AM   #7
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After installing a Deplhi main pump, I now notice a distinct "whine" of the pump (as it pressurizes the system I ass-u-me)anytime time the key is turned to ignition position(Christmas lights on dash).

1992 240
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Old 08-09-2017, 05:42 AM   #8
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Originally Posted by Otto Mattik View Post
After installing a Deplhi main pump, I now notice a distinct "whine" of the pump (as it pressurizes the system I ass-u-me)anytime time the key is turned to ignition position(Christmas lights on dash).

1992 240
Ahhh the whiny Delphi pump. I have one. You'll know when it stops working.
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Old 08-09-2017, 09:27 AM   #9
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Thanks for all your replies,I don't plain on changing it I just was interested in knowing why Volvo ran it that why.You got to love Volvo safety.
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Old 08-09-2017, 10:26 AM   #10
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Quote:
Originally Posted by bobxyz View Post
It's a safety thing - you don't want the fuel pump running when the engine is stopped. For instance, after an accident you don't want to pump extra fuel onto any fire, or puddle on the ground.

K-Jet uses the distributor (actually the coil) to detect cranking/running. This energizes the fuel pump relay as long as the cranking/running continues.
Which is why the cars have a rollover sensor.
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Old 08-09-2017, 10:40 AM   #11
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What position is "start"?
That would be 'KP3'
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Old 08-11-2017, 03:20 AM   #12
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Ahhh the whiny Delphi pump. I have one. You'll know when it stops working.
Oh gawd

mahr oatmeal ?
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