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  #1  
Old 03-12-2013, 03:02 PM
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Lift pump early vs later model....

So I don't have the part numbers off hand but there are 2 different style lift pumps used on w123's. There is an early version that can't be rebuilt then a later style that we all know and can be rebuilt. I bought a spare one at pnp the newer style. I was wondering if anyone knows if the specifications of both are the same or is one say the newer style better? I figure there must have been a reason for Mercedes to change them but I can't find or figure why?

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Old 03-12-2013, 03:14 PM
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i know my 74 240D has a lift pump with 2 bolts . where as the 79 i had had 3 bolts on the lift pump ... so there maybe be more than just 2 types ,
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Old 03-12-2013, 03:25 PM
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Quote:
Originally Posted by wildhorsemfg View Post
i know my 74 240D has a lift pump with 2 bolts . where as the 79 i had had 3 bolts on the lift pump ... so there maybe be more than just 2 types ,
It is highly doubtful that your 1974 240D was a W123.
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Old 03-12-2013, 03:35 PM
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Here's a pic I umm borrowed from someones thread....this is the early style that is on my car.



And of course this is one we see on all the other w123's



What's funny is I pulled the newer style lift pump off a 78 300sd and mine is a 78 300d but has the older style..
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Old 03-12-2013, 04:04 PM
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Quote:
Originally Posted by cooljjay View Post
Here's a pic I umm borrowed from someones thread....this is the early style that is on my car.



And of course this is one we see on all the other w123's



What's funny is I pulled the newer style lift pump off a 78 300sd and mine is a 78 300d but has the older style..
The Photo of the Old Lift Pump is good but not good enough to read that little number Plate that is on it.
Copy down those Numbers and take the Numbers to a Bosch Shop (or call them) and see if they make a Rebuild Kit for it.
Or do the same with the Plican Parts guy.
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Old 03-12-2013, 05:03 PM
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I think the change may have had to do with the turbo. I believe the NA diesels use on type and the turbo diesels use another.. could be wrong though...
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Old 03-12-2013, 06:47 PM
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Originally Posted by dude99 View Post
I think the change may have had to do with the turbo. I believe the NA diesels use on type and the turbo diesels use another.. could be wrong though...
That's what I was curious about, and I was wondering if adding the Turbo type/newer style might increase power?
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Old 03-12-2013, 07:45 PM
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Assuming that the newer version could flow more (which I have no idea if it does or not) it wouldn't increase power unless your existing one was already not putting out enough at the correct pressure. The injection pump puts out metered amount with each stroke of an element. Without increasing the size of the elements (and thus the amount of fuel delivered) no more power can be made. This is a moot point however since you have the non turbo version of the car, so even if you tuned the pump for more fuel, it wouldn't burn it because of lack of air.

Best thing to do if you want the maximum your engine can give is to check timing chain stretch and compensate for it with a woodruff key on the cam if necessary, make sure your pump timing is correct, and have the injectors tested for patter/flow/balence (odds are by this point they need rebuilding)
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Old 03-12-2013, 08:13 PM
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Quote:
Originally Posted by cooljjay View Post
That's what I was curious about, and I was wondering if adding the Turbo type/newer style might increase power?
Not if the Old One is working correctly.
I say that because only a tiny amount of the Fuel From the Fuel Supply/Lift Pump ends up Injected into the Engine. Most of the Fuel is used to cool the Fuel Injection Pump Housing and returned to the Fuel tank.

A problem with the Fuel Pressure Relief/Overflow Valve is more likely to have an effect on the performance.
Long Fuel Pressure Relief Valve/Overflow Valve Thread
http://www.peachparts.com/shopforum/showthread.php?t=234609
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Old 03-12-2013, 11:53 PM
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Answer

Quote:
Originally Posted by cooljjay View Post
That's what I was curious about, and I was wondering if adding the Turbo type/newer style might increase power?
NO, it will not add power unless your valves MB# 0000900210 are bad.
A damaged or mis-adjusted fuel bypass valve will make a good lift pump waste pressure.

Fuel injection pump starvation with a good lift pump
Fuel injection pump starvation with a good lift pump - PeachParts Mercedes ShopForum

Fuel pressure relief valve adjustment
Fuel pressure relief valve adjustment - PeachParts Mercedes ShopForum

lift pump test
1979 300td -- Can anybody walk me through a lift pump test? - PeachParts Mercedes ShopForum

fuel pressure
fuel pressure - PeachParts Mercedes ShopForum

Up to a point:
Mechanical injection Diesel Power is a function of increased fuel = altitude compensation device, delivery valve bore, injector, and internal governor adjustment.
This assumes compression and timing are good.

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  #11  
Old 03-13-2013, 05:01 AM
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I've got some non-turbo lift pump related information here (mostly about the pump fitted to my M/RSF IP)

Refreshing the fuel pump on an OM617 (European spec – non turbo)

This might help

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