91 VW injection pump question

[spdrace11]

I have a 91 Diesel 2dr Jetta.  I have an opportunity to get a rebuilt injection pump however it looks a little different than the one i have.  It seems to be the earlier style pump with out the altimeter (weird thing they added on the top of the pumps in later vw's)  It also has a "performance" rebuild.  Now my question is how will the older style pump effect the motor when compared to the new one and how will the "performance" rebuild effect my economy? 

[arb]

I have a 91 Diesel 2dr Jetta.  I have an opportunity to get a rebuilt injection pump however it looks a little different than the one i have.  It seems to be the earlier style pump with out the altimeter (weird thing they added on the top of the pumps in later vw's)  It also has a "performance" rebuild.  Now my question is how will the older style pump effect the motor when compared to the new one and how will the "performance" rebuild effect my economy? 

Depending on what you have..... do you know if its a Giles pump ? :-D  If yes, more power and mpg are in order. If not, it depends on what they did. It will bolt on and work, but several areas might be different like the fuel lines and cold start lever.

[spdrace11]

It was rebuilt by this guy http://www.performancediesel.ca/index.htm.  Well the car its on is a 90-92 Jetta also which is why i dont understand why it has a different pump then mine.

[Vincent Waldon]

Yup, that's the coveted Giles pump... SCORE!!!!!

If you call him/email him and tell him what you have and what vehicle you are using he'll be able to explain in great detail why it's different and if it means anything...he's always responsive to questions in my experience.

Or... post a couple pictures and we can help you out as well.

[spdrace11]

Ok thanks.  Im hoping to get about 50mpg sense i have gotten 47 mpg on 220k motor in the past.  I will try to get some more info.  Is 50 mpg obtainable??  I also have a 81 Cabby and that for sure gets about 50mpg.

[spdrace11]

Also this injection pump doesnt have the "altimiiter".  The diaphram looking think on top of the IP.  What does this do and does it matter that one pump has it and the other one does not??

[Baron VonZeppelin]

Also this injection pump doesnt have the "altimiiter".  The diaphram looking think on top of the IP.  What does this do and does it matter that one pump has it and the other one does not??

I'm going to try -NOT- to confuse you too much - hopefully.

89-92 Non-Turbo Diesel / Non-ECO Diesel .... just the standard NA Diesel ... used an altitude adjusting system ... it works similar - but exactly opposite - of a Turbo Diesel system.

The spaceship on top of 89-92 NA Decreases fueling under circumstances. (when device on fenderwell senses thinner atmosphere - it actuates)

The spaceship on top of 83-92 TboDzl Increases fueling under circumstances. (when boost pressure builds in intake - it actuates)

In other words - you don't need the altitude aneroid on your car/injection pump. I've even disabled them on my both my 89's.

The pump you are looking to buy is most likely from an 81-88 NA Diesel. With it being one of Giles 'performance' rebuilds - i'd be all over it in a heart beat. If the asking price is high, i'd want to see the receipt from Giles for the job. Giles also does standard/basic rebuilds ... which would still be top notch ... but not as valuable.
His performance rebuilds are VERY desirable.

As mentioned by ARB, your exisitng injector fuel lines likely will NOT bolt up/match correctly at the pump end. Due to lengths and bends. See if you can also get the hardlines from the car that the pump was installed on.

There are basically 4 styles of hardlines between Mk1 and Mk2 Diesels. NA - TD - Altitude - ECO.

From what i'm told - none will interchange properly from one pump style to another.

[spdrace11]

Also this injection pump doesnt have the "altimiiter".  The diaphram looking think on top of the IP.  What does this do and does it matter that one pump has it and the other one does not??

I'm going to try -NOT- to confuse you too much - hopefully.

89-92 Non-Turbo Diesel / Non-ECO Diesel .... just the standard NA Diesel ... used an altitude adjusting system ... it works similar - but exactly opposite - of a Turbo Diesel system.

The spaceship on top of 89-92 NA Decreases fueling under circumstances. (when device on fenderwell senses thinner atmosphere - it actuates)

The spaceship on top of 83-92 TboDzl Increases fueling under circumstances. (when boost pressure builds in intake - it actuates)

In other words - you don't need the altitude aneroid on your car/injection pump. I've even disabled them on my both my 89's.

The pump you are looking to buy is most likely from an 81-88 NA Diesel. With it being one of Giles 'performance' rebuilds - i'd be all over it in a heart beat. If the asking price is high, i'd want to see the receipt from Giles for the job. Giles also does standard/basic rebuilds ... which would still be top notch ... but not as valuable.
His performance rebuilds are VERY desirable.

As mentioned by ARB, your exisitng injector fuel lines likely will NOT bolt up/match correctly at the pump end. Due to lengths and bends. See if you can also get the hardlines from the car that the pump was installed on.

There are basically 4 styles of hardlines between Mk1 and Mk2 Diesels. NA - TD - Altitude - ECO.

From what i'm told - none will interchange properly from one pump style to another.

Ok thanks thats what i want to know.  Basically i am doing a VR swap in a Jetta and in return i get his 4 door na diesel.  He is friend of mine so i know everything is legit and he said he is sick of driving a slow diesel.  It also has some head work done p&p, angle valve job, giles pump.  It was dyno'ed about 70 hp which is more than my NA diesel and I definitely noticed it when i drove it.  So my plan is to swap that drivetrane in to my minty Jetta coupe diesel and then sell his car.