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2003 E320 4matic wagon; 1979 450 SL
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213 Posts
Discussion Starter #1
Just noticed that when my key is in #1 pos. fuel pump runs continuously. I thought they were supposed to turn off when they don't get a run signal?
 

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R/C107 Moderator
1986 560SL: '84 500SL: '84 280SL 5 speed: other 107s
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31,716 Posts
Make sure the safety switch on the air assembly in front of the fuel distributor is plugged in.
 

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2003 E320 4matic wagon; 1979 450 SL
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213 Posts
Discussion Starter #5
Everything appears to be plugged in. I did mess with the fuel distributor air intake plate,trying to center it. Don't know what that would have to do with fuel pump running..
 

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Premium Member
1976 450SL
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421 Posts
Just noticed that when my key is in #1 pos. fuel pump runs continuously. I thought they were supposed to turn off when they don't get a run signal?
My car has the same problem - it appears that the switch on the housing for the intake is not closing. It's on my list to fix...

To confirm this: With the ignition off, disconnect the plug from the inlet housing, and short together the two connectors (on the plug side, not the switch). Then turn the ignition on. The pump should no longer run continuously (but, neither will the engine start - this is just a check to ensure the problem isn't elsewhere)

-Steve
 

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2003 E320 4matic wagon; 1979 450 SL
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213 Posts
Discussion Starter #7
Is that the small rectangular plug just forward of the air intake and a bit toward the driver's side? Thanks
 

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Premium Member
1976 450SL
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421 Posts
Is that the small rectangular plug just forward of the air intake and a bit toward the driver's side? Thanks
No... It's just behind the air intake, and on the right (passenger) side... At least on my '76 450sl. I think it's blue (but not in the garage to check)

-Steve

Sent from my SM-G892U using Tapatalk
 

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2003 E320 4matic wagon; 1979 450 SL
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213 Posts
Discussion Starter #13
This is what I woke up to Thursday morning in Maine. My 450 SL is on the left.
603D7E7B-4CF7-4E6B-818D-297652C30B03.jpeg
 

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Outstanding Contributor , Bob's Your Uncle!
-----'83 280 SL----- 5 speed....The PIG
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29,143 Posts

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2003 E320 4matic wagon; 1979 450 SL
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213 Posts
Discussion Starter #19
Thanks , nobody got hurt. so, that's a blessing. The cars,just sheet metal.
 
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