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  #1  
Old 05-07-2004, 10:31 PM
JamesStein's Avatar
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Fuel Line Pressure

Does anyone know if the fuel system is pressurized in a 300TD? I'm installing a fuel swith to add a WVO tank. The 6 port solinoid I bought claims it can only have 8 psi of pressure in it.

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  #2  
Old 05-08-2004, 03:46 AM
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JamesStein,

Don't know about later models but the W123 300DT models are at atmospheric pressure until they get into the pumps. The line from the tank to the connection at the injection pump is basically gravity fed. There is a venting system to prevent pressure or vacuum, which can get plugged and cause problems of its own. Hope this helps, Jim
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1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
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  #3  
Old 05-08-2004, 12:15 PM
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Re: Fuel Line Pressure

Quote:
Originally posted by JamesStein
Does anyone know if the fuel system is pressurized in a 300TD? I'm installing a fuel swith to add a WVO tank. The 6 port solinoid I bought claims it can only have 8 psi of pressure in it.
James,
Where are you installing the solenoid?
If before the lift pump, pressures are at or below atmospheric.
If between the lift pump and IP, the pressures are above atmodpheric, but until I have the time for investigation, I cannot tell the pressures at that point, so play it safe and use a fuel pressure regulator to ensure that damage does not occur.
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Fatmobile 3 84 300D 295kkm Silver grey/Blue int. 2 tank WVO - Recipient of TurboDesel engine.
Josephine '82 300D 390kkm White/Palamino int.
Elizabeth '81 280E, sporting a '79 300D engine.
Lucille '87 W124 300D non-turbo 6 cylinder OM603, Pearl Grey with light grey interior


Various parts cars including 280E, 230C & 300D in various states of disassembly.
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  #4  
Old 05-08-2004, 12:35 PM
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Re: Fuel Line Pressure

Quote:
Originally posted by JamesStein
Does anyone know if the fuel system is pressurized in a 300TD? I'm installing a fuel swith to add a WVO tank. The 6 port solinoid I bought claims it can only have 8 psi of pressure in it.
James,
Where are you installing the solenoid?
If before the lift pump, pressures are at or below atmospheric.
If between the lift pump and IP, the pressures are above atmodpheric, but until I have the time for investigation, I cannot tell the pressures at that point, so play it safe and use a fuel pressure regulator to ensure that damage does not occur.
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Tony from West Oz.
Fatmobile 3 84 300D 295kkm Silver grey/Blue int. 2 tank WVO - Recipient of TurboDesel engine.
Josephine '82 300D 390kkm White/Palamino int.
Elizabeth '81 280E, sporting a '79 300D engine.
Lucille '87 W124 300D non-turbo 6 cylinder OM603, Pearl Grey with light grey interior


Various parts cars including 280E, 230C & 300D in various states of disassembly.
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  #5  
Old 05-08-2004, 10:30 PM
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I was planning on installing it into the engine compartment. Where is the lift pump?

BTW its an '84 300TD
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  #6  
Old 05-08-2004, 10:32 PM
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I think that was OzzySpeak for injection pump....
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  #7  
Old 05-09-2004, 12:25 PM
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Quote:
Originally posted by JamesStein
I was planning on installing it into the engine compartment. Where is the lift pump?

BTW its an '84 300TD
On a '84 300D (non-turbo), the lift pump is mounted on the side of the injector pump.
The fuel comes from the tank, flows thru a pre-filter and then into the lift pump. From the lift pump, the fuel goes thru the main fuel filter and then to the injector pump.
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Tony from West Oz.
Fatmobile 3 84 300D 295kkm Silver grey/Blue int. 2 tank WVO - Recipient of TurboDesel engine.
Josephine '82 300D 390kkm White/Palamino int.
Elizabeth '81 280E, sporting a '79 300D engine.
Lucille '87 W124 300D non-turbo 6 cylinder OM603, Pearl Grey with light grey interior


Various parts cars including 280E, 230C & 300D in various states of disassembly.
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  #8  
Old 05-24-2004, 12:04 PM
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I've installed the valve.. So far it appears to be working without any trouble.

It's installed before the lift pump. Fuel comes in from the fuel lines through the valve into the lift pump.

I've bled and bled and bled and I can't seem to evacuate all of the air from the small filter in line right before the lift pump. Other than installing bleeder valves all over the place is there an easy way to get the last bit of air out? It doesn't seem to be effecting the performance of the engine (at least not in a way noticable to the eye/ear).
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  #9  
Old 05-24-2004, 01:09 PM
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That bubble in the prefilter is always there. Don't worry about it.
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  #10  
Old 05-24-2004, 02:59 PM
Ibe300D
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Quote:
Originally posted by Rick Miley
That bubble in the prefilter is always there. Don't worry about it.
You seeing this Dieselbeagel?

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