My fuel pump is whining, so I guess it's time to replace. My question for the masses is: Do I just replace with stock, or is there a retrofit kit (I know UMW had one at one time) which is an improvement?

My tune is EPL and next mod will be 18g billet upgrade. I already have his recommended 72lb. injectors on the shelf and ready to go. My goal is 600 RWHP. What are you guys in the same HP range running with 18g's?

I am not interested in a fuel system rebuild as I believe the stock pump can handle my goal (I will be done at 600!) But, since I have to spend the money on a new pump anyways, if there is something more stout that will give some added insurance, I am game.

 

https://www.6speedonline.com/forums/...pic-heavy.html

 

^ What he said!!

 

That's a great DIY, but the easiest plug and play oem solution would be to drop in the 997 pump

Edit: this is incorrect, see below

 

Thanks. Tim does great work, but this is basically a fuel system rebuild the way I see it.

I have heard mention of this before. Confirm it is a drop in, plug and play application? What are the advantages over the 996 pump?

 

Anyone found a better price than $490 on a stock replacement?

 

My understanding is that the 997tt twin pump is a fuel return less system (unlike the 996tt/gt2) and is not plug and play by any stretch of the imagination. Can you point to a single 996tt running the 997tt set up?? I do know that the 996tt pump has been redesigned by Porsche (it now ends in part number 02) employing better lines as the old lines were prone to cracking. The old stock (00 and 01) was pulled off the shelves by Porsche.

 

997.1TT is definitely a return style system, IIRC only the DFI engines are running returnless
Would be nice to see some confirmations on the 996>997 conversion

 

Correct - I don't know anyone that has done a 997 fuel pump install.

997.1 is a return system, the fuel rail run a 3.8bar reg like the 996. However, the 997 has two fuel pumps that are staged. Only one pump runs under low demand, and which pump that is, is controlled by the dme, based on how much fuel is left in the tank. Honestly, I think it would take more customization to get the 997 pumps and basket to work than doing a custom twin pump setup.

Honestly, just drop a walbro in there. While it would be beneficial to run the dash 6 line like Tim recommends, you don't have to. This will give you more flow than stock, and the only think you will need to do is connect the wiring.

Btw - after comparing the gt2 and turbo setup, the pumps are identical. The difference is in the fuel tank. The gt2 doesn't have the suction pumps, as it doesn't have the horseshoe tank. By not having the suction pumps, it's not wasting flow trying to lift the fuel up to the pump. Therefor the gt2 does have a higher flow rate than the turbo (I think AMS measured this and it was more than 15%) - go with the walbro and just run the stock fuel lines until you run out of fuel.

 

That's a good diy and appears to be a viable option. It's interesting to see that the Walbro pump is actually more compact (smaller diameter) than the OEM pump that is removed. I wonder how much more pumping capacity the Walbro has compared to OEM. Anyone have specs on the OEM pump, I guess it'a a Bosch right?

Also, if you are not going to be replacing any of the fuel lines downstream, is there any point in replacing the fuel supply nipple in the tip of the basket with the larger AN-6 fitting? I would think not as the fuel lines are probably the restrictor in the system. I guess Tim would probably be in the best position to answer that though.

 

Service manager at the dealer told me the 997 was an updated part for the 996, like the coils. Guess he was mistaken. Sorry for the bad info.

 

Made by VDO.

 

Stock 996 turbo is a Bosch 040 pump. Radium texted this and it flowed about 200lph at 1.3bar of boost. The Bosch 044 (that some people install inline) flows 280lph and the walbro e85 flows 320. Now, take the flow rates with a grain of salt, as voltage effects them greatly, but its a good baseline

http://radiumauto.com/media/techarticle-page.php?Radium-s-Ultimate-Fuel-Pump-Test-87

Now AMS tested the 996tt setup a couple of years back, and noted with the jet pumps flow to the engine was reduced 25%. So the stock 996tt flows about 150lph, the gt2 200lph (no jet pumps) and a modified 996tt with walbro would be about 240lph.

So you can see, that the walbro e85 pump on the turbo is about the same level of improvement that the gt2 has over a stock turbo.

Tim was right with suggesting to use the walbro pump. It's a great upgrade, even if your running stock lines, for a car that is making upto 650whp. It's also way quieter

 

This is great information guys! Thanks for clearing up the 997 pump confusion. I guess I''ll take another look at Tim's conversion. It may not be so bad if using stock lines...

 

+1 It's a great in-between solution. It will do what you want!