td5 fuel pump in a 300tdi - Defender Source
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  #1  
Old September 18th, 2008, 10:12 AM
Muscat
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Mark B
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td5 fuel pump in a 300tdi

Gents,

The 300tdi fuel lift pump puts out 3 - 4 lbf/in2 (on a good day). The low pressure side of the td5 puts out 7.25 lbf/in2. Would it be possible to run the td5 rear fuel tank and fuel pump on a 300tdi if I disabled the high pressure side of the pump? Or would 7.25 lbf/in2 cause problems at the injector pump on the 300tdi?

I ask because I am modifying a 300tdi chassis to accept a td5 rear mounted fuel tank and I happen to already have the tank and pump.

Alternatively, if I keep the td5 fuel tank, but discard the in-tank pump in favour of the mechanical lift pump on the 300tdi, is it possible to simply dismantle the td5 pump but keep the fuel sender?

Hoping for advice!

Regards,
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  #2  
Old April 1st, 2010, 06:25 PM
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Paul
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Quote:
Originally Posted by Muscat View Post
Alternatively, if I keep the td5 fuel tank, but discard the in-tank pump in favour of the mechanical lift pump on the 300tdi, is it possible to simply dismantle the td5 pump but keep the fuel sender?
Mark or anyone,

Any idea if one can utilize only the fuel sender and pickup from a 110 td5 pump? If so, what about adapting mid 80 tank wiring to the tf5 plug?

-Paul
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  #3  
Old April 1st, 2010, 11:01 PM
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I know nothing of the TD5 but I would say this is not a good idea at all. The 300 pump can produce enough fuel to overheat the egt just fine. In order to deal with the extra fuel, you would have to get way more air in there. Bigger turbo ect. Then are you going to grenade the motor? Dunno.

This is all if you figure out a way around the original pump.

Dunno on the other question, but senders are cheap. Heck, I can send an extra one I have to you.
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  #4  
Old April 2nd, 2010, 07:09 AM
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Having a higher pressure pump works fine as the extra fuel just gets pushed back through the return line.I've run one with a 7psi electric (emergency) external gasoline fuel pump. However, I wouldn't recommend using the Td5 pump. Remove it from the in tank unit and pull the wires out. You can keep the sender for the gauge. Then you can use the very simple, cheap and robust stock pump.
Some of the later 300tdi Defender 90's had a Td5 style rear tank with a in tank unit that looked like it was designed to hold a pump but only had a gauge sender, it even had a 4 pin plug with only 2 pins being used (useless Rover trivia). I just built one and have pics and part #'s at the shop and will post them if you'd need.
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  #5  
Old April 2nd, 2010, 07:48 AM
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I have removed the pump from v-8 pickups no prob just like Matt said. Just turn it from a pump to a pickup tube...
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Old April 2nd, 2010, 07:53 AM
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I would think you'll need to also confirm that a TD5 sender will work with your fuel gauge. Not sure about these newfangled instruments, but many sender/gauge setups are matched to each other.
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  #7  
Old April 2nd, 2010, 09:11 AM
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Assuming you want to run a pump that is buried up on top of the tank and is hard to replace, wouldn't it simply be possible to run a fuel pressure regulator?
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  #8  
Old April 2nd, 2010, 09:30 AM
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The Tdi will run with NO pump at all (as the 2.8 international does), so i can't see that "upgrading" it to 7lb would do any good.

PLus, it's far easier to change a Tdi mechanical lift pump on the side of the engine than it is to change a Td5 in tank pump.
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  #9  
Old April 2nd, 2010, 10:36 AM
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Gren Thomas
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Hi mark I would not use the TD5 pump it will work but bound to cause leaks in the long run, also the return line will get warm from the over pressure diesel squirting back to the tank. the 300 pump is fine for the job and designed for the engine, is cheap and easy to replace.... remember K.I.S.S.?
as for your sender the td5 & 300 tdi use different resistances to get FSD on the guage so sender and guage need to be matched.

best solution is to blank the pump hole in the tank and the fit a VDO sender and gauge, the good thing with VDO sender is you can change its length and still get FSD.(full scale deflection) on the guage.

as an aside the TD5 instruments are made by VDO but use different resistances on the senders.

regards

Gren
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  #10  
Old April 7th, 2010, 06:04 PM
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Matt, I would love the pics/part numbers/info on adapting a td5 tank sender/integral pump to work with an engine driven pump (4BD1T) and older style wiring.

Gren, is there a particular VDO sender/gauge that you would recommend for use with a td5 tank?

-Paul

I think the OP was looking at a td5 tank and 300tdi.
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  #11  
Old April 7th, 2010, 08:48 PM
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Quote:
Originally Posted by JimC View Post
Assuming you want to run a pump that is buried up on top of the tank and is hard to replace, wouldn't it simply be possible to run a fuel pressure regulator?
The return banjo bolt on the injection pump is indeed a "fuel pressure regulator. But I agree with Matt, it is not really a good idea to use the electric pump instead of the mechanical in this situation.. If one really wanted to run the electric pump a regular banjo bolt should be substituted for the regulator one on the injection pump. And then run an external pressure regulator that is made to run with the pressure output of the Td5 electric pump.
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  #12  
Old April 8th, 2010, 10:35 AM
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Gren Thomas
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TBH Paul i just ordered what i needed from the local vdo supplier (demon tweeks) i wanted a lever are type as i was sure i could mix and match betweel LR sender if it came to it, as it happens it all worked fine on the normal steel tank, and even easier on a mates td5 hybrid.

fuel gauge is standard VDO vision type for float arm.

sender pdf attached

regards

Gren
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File Type: pdf FuelLeverArmGauge.pdf (343.4 KB, 151 views)
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