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  #1  
Old 06-22-2007, 01:56 PM
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where the fuel pump?

Hey guys probably a dumbass question but where is the fuel pump on a 1987 300d? Is it in the gas tank? Thanks guys

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Old 06-22-2007, 02:03 PM
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or is the IP the only pump? Gravity fed?
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17' rogue SV 35k
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95' e300 diesel 267k

sold
02' e320 210k
00' e430 167k
01' e320 171k (regret sale)
91' 300d 2.5t 300k (sold to ecoofidaho)
79' 240d 177k (old yellow my avatar)
87' 300d 169k (junk but fast)
85' 300tdt 261k (RBM parts delivery)
85' 300dt 68k (one owner cream puff)
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  #3  
Old 06-22-2007, 02:48 PM
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the little unit below the hand pump is the main supply pump. mercedes number 000-090-19-50
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  #4  
Old 06-22-2007, 03:16 PM
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The handpump is not on the 87 engine that is a 603 engine with no primer pump. But it still has a lift pump. It's on the injection pump.
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  #5  
Old 06-22-2007, 03:20 PM
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So there is not one on the fuel tank? I thought I remembered a buzzing sound from back there when i glowed the plugs.... hmm oh well. Thanks

I am not getting fuel to the IP. If I hook an electric pump to it and get the gravity goin it runs fine. But if I let the nose of the car get higher than the fuel tank it starves itself out of fuel. I have to hook up the pump again.
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Current stable......
17' rogue SV 35k
08 9-3 SportCombi 150k
95' e300 diesel 267k

sold
02' e320 210k
00' e430 167k
01' e320 171k (regret sale)
91' 300d 2.5t 300k (sold to ecoofidaho)
79' 240d 177k (old yellow my avatar)
87' 300d 169k (junk but fast)
85' 300tdt 261k (RBM parts delivery)
85' 300dt 68k (one owner cream puff)
82' 240d 250k
84' 300dt 198k (sold to diesel don)
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  #6  
Old 06-22-2007, 03:23 PM
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You might have a fuel tank venting problem. Does it run better with the fuel filler cap off?

Sixto
93 300SD 3.0 - comatose
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  #7  
Old 06-22-2007, 10:32 PM
ForcedInduction
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Quote:
Originally Posted by joegolden View Post
I thought I remembered a buzzing sound from back there when i glowed the plugs
There is an electric vacuum pump in the trunk near the spare tire.
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  #8  
Old 06-22-2007, 10:49 PM
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Quote:
Originally Posted by joegolden View Post
If I hook an electric pump to it and get the gravity goin it runs fine. But if I let the nose of the car get higher than the fuel tank it starves itself out of fuel. I have to hook up the pump again.
The lift pump is on the driver's side of the IP, mechanically operated.
Sounds like you have an air leak into the fuel lines around the IP. Happens all the time on 606 motors. The most common leak on the 606 is at the prefilter O-ring, does the 603 have a similar prefilter? Is your main filter on tight enough?

What's happening is that there is air being allowed into the suction side of the fuel system. Fuel then drains back to the level in the tank. By using the electric pump, you are pulling the fuel back up to the level of the mechanical pump, which can then easily supply it to the IP.

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