Fuel tank for upgraded 4.6? - Defender Source
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  #1  
Old May 16th, 2015, 08:32 AM
jason1st
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Jason Crandall
2006 LR3 2012 SC 1983 110
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Fuel tank for upgraded 4.6?

Do I need a whole new fuel tank assembly on my 1984 110 for an upgraded GEMS 4.6? Or can I just get a new pump and use the existing tank?
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  #2  
Old May 16th, 2015, 09:14 AM
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Jamie Austin
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When I fitted a 3,9 efi into my old 90 (with the euro side tank), I just used an in-line fuel injection spec pump. worked a treat. Vehicle was originally a 200Tdi, and I used the same diesel pickup pipes.
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  #3  
Old May 16th, 2015, 10:21 AM
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Bill Larson
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Why would you need a new pump or tank...what am I missing?
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  #4  
Old May 16th, 2015, 10:32 AM
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John B.
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The existing pump will be low pressure. You can just use an external aftermarket pump.
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  #5  
Old May 16th, 2015, 10:58 AM
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Bill Larson
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Bill Larson
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This is petrol...why is there a difference? A higher pressure would be require for what? the distance is the same. Is there an injection pressure difference? Just curious because in my configuration no pressure reconfigurations were required. This is a 3.9 to 4.6 right?
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  #6  
Old May 16th, 2015, 11:08 AM
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John B.
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He had an 84 engine. It would have been carbs and low pressure. The new engine is efi and high pressure.
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  #7  
Old May 16th, 2015, 11:12 AM
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Bill Larson
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Bill Larson
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Quote:
Originally Posted by Red90 View Post
He had an 84 engine. It would have been carbs and low pressure. The new engine is efi and high pressure.
Ah...well there you go! lol...
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  #8  
Old May 16th, 2015, 12:55 PM
jason1st
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Jason Crandall
2006 LR3 2012 SC 1983 110
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New engine is 4.6 EFI.

Old engine is a carbed 3.5

So I definitely need whole new tank assembly or an external pressure pump? Is there a downside to the external pressure pump vs. new tank with internal high pressure pump? Just another pump to fail? I'm a "do it right the first time" kinda guy.

Jason
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  #9  
Old May 16th, 2015, 01:15 PM
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John B.
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Either will work fine. Obviously an external pump is easier to access if needed. The external is probably a little louder. Make sure there is a proper EFI fuel filter after the pump.
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  #10  
Old May 16th, 2015, 06:44 PM
jason1st
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Jason Crandall
2006 LR3 2012 SC 1983 110
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Can you post a link of an external high pressure pump and filter that will work?
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  #11  
Old May 17th, 2015, 01:45 AM
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Jafir Elkurd
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Don't 110 and RRC have the same tanks? If it's got the hole in the top can't you just drop an early metal RRC fuel pump into it?
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  #12  
Old May 17th, 2015, 06:57 AM
jason1st
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Jason Crandall
2006 LR3 2012 SC 1983 110
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Quote:
Originally Posted by jafir View Post
Don't 110 and RRC have the same tanks? If it's got the hole in the top can't you just drop an early metal RRC fuel pump into it?
That's the question I'm asking. Is an early RRC full pump "high pressure"?
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  #13  
Old May 17th, 2015, 07:28 AM
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Kevin Keith
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87-90 RRC use the metal tank & EFI pump… same as the 93 110. Not sure how that translates to your 84.
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  #14  
Old May 17th, 2015, 08:02 AM
jason1st
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Jason Crandall
2006 LR3 2012 SC 1983 110
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Here is the link to the NAS 110 fuel pump. It says:

"Fits vehicles with steel tank that have a separate pump and sending unit."

What does that mean?

FUEL PUMP V-8 EFI NLA USE PLF131, RNF131, PRC8318 - Rovers North - Classic Land Rover Parts
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  #15  
Old May 17th, 2015, 08:08 AM
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Jafir Elkurd
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That's saying it doesn't fit the later RRC that uses the big disco style plastic fuel pump with the built in sending unit.

Is your tank metal? Does it have a big hole in the top? It looks like some early 110 just have a hole in the side of the tank. I'm guessing if it's got a hole in the top you can put the RRC fuel pump in it, from an early RRC with FI. If it's had FI, it's high pressure.
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  #16  
Old May 17th, 2015, 08:12 AM
jason1st
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Jason Crandall
2006 LR3 2012 SC 1983 110
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Yes, my tank is metal and has the hole in the top.

So a new 4.6 doesn't have a different pressure need than a '93 NAS?
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  #17  
Old May 17th, 2015, 10:15 AM
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Kevin Keith
1988 RRC
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IIRC all the EFI's used the same pressure controlled by the FP regulator.
Like Jafir said, if you have the hole on top and the separate sender on the side it may work. I can measure the diameter on the pump if that helps in anyway.
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