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#1
06-14-2006, 06:30 PM
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87 300sdl Fuel system questions
I was wondering if someone could explain the flow of fuel up to the injector pump. My main question is which appendage on the IP is the lift pump. There are two and either one could be it, although one has a couple extra hoses and seems to be some sort of plastic encased in metal (possible pre-filter?
Thanks Will
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Thanks, Will 1985 300D- 222k- (bad transmission) 1980 300D- (parts car) 1982 300SD- 242k 
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#3
06-14-2006, 06:49 PM
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It is one of two appendages on the left hand ie. driver's side. So my question is which one of the two is the lift pump...my question in photo form is uploaded.
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Thanks, Will 1985 300D- 222k- (bad transmission) 1980 300D- (parts car) 1982 300SD- 242k Last edited by will_sanderson; 06-14-2006 at 07:49 PM.
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#4
06-14-2006, 07:51 PM
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Image questions
Here is the photo with questions #1 & 2...
Thanks
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Thanks, Will 1985 300D- 222k- (bad transmission) 1980 300D- (parts car) 1982 300SD- 242k
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#5
06-14-2006, 08:39 PM
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The first one is. The second is somthing for the fuel heating system. I forget a T stat maybe.
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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#6
06-14-2006, 08:39 PM
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Trace back from the injectors
Start at the injectors and trace back. When you get to where all of them lead you are at the IP. The other one is the lift pump.
-Jim
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1995 S350D, Green with black leather interior. Bought January 2008 w/ 233,xxx miles. I did 22,000 miles during the first year of ownership.
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#7
06-14-2006, 09:10 PM
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Sorry about that. I interpreted appendage to be something attached. The fuel thermostat is attached to the crossmember or engine mount. It's not attached except by the fuel lines to the IP. As confirmed, the item that is physically bolted to the IP is the pump.
Sixto
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#8
06-15-2006, 03:01 PM
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Thermostat
You're right the thermostat is connected to the crossbar...thanks.
So my next two questions are: 1- Is there an in the fuel tank screen or sock that if dirty could be limiting fuel flow. If so, can it be removed just like a 300D? 2- Does anyone know exactly how the thermostat works and what its function is? Does it keep the fuel at a constant specific temp. by cooling or heating? Can it get plugged and therefore limit fuel flow? Thanks,
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Thanks, Will 1985 300D- 222k- (bad transmission) 1980 300D- (parts car) 1982 300SD- 242k
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#9
06-15-2006, 03:55 PM
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1. There is a screen in the fuel tank that can be removed and cleaned or replaced. The right axle is somewhat in the way of proper access but it's not so bad.
2. The thermostat is just a fuel loop into a coolant passage in the cylinder head near the oil filter block. It's simple enough to bypass the thermostat to determine if it's causing a problem. The typical failure of thermostat involves leaking, not blockage. Sixto
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#10
06-15-2006, 05:57 PM
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Never heard of a fuel t stat failing on a 603. What problem are you trying to solve?
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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#11
06-15-2006, 07:08 PM
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Problem
Thanks for the information, I will remove the screen filter in the tank.
My problem is that fuel is not reaching the engine...so I thought I would work from the tank forward. I have a new filter.
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Thanks, Will 1985 300D- 222k- (bad transmission) 1980 300D- (parts car) 1982 300SD- 242k
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