He can be replaced with something. I have even seen guys replace it with hard fittings.

 

Well, that was not your usual helpful self answer Sam! Who has replaced this hose and with what???

 

Much appreciated. I'm in Denver. I will look in PET to see if the Boxster tanks cross reference. I would actually prefer the 67L tank. I will be swapping out my suspension this winter and that would be a good time to do it. If I come across the 90L one I will PM you..

 

The latest version (-02) of the OEM pumps no longer use that rubber U piece but a plastic one instead.

Slightly off topic, but does anyone have the physical dimensions of the OEM VDO pump. How about flow data?? The popular in tank Bosch 040 is physically much larger than the VDO but can be retrofitted to the factory basket by simply grinding out the plastic cradle (see picture below). The huge advantage of the 040 is it's ability to deliver stable fuel flow with a very low amperage draw (6 Amps vs 18 Amps for the 450s) thus keeping fuel temps low. If the 040 can deliver maybe 20% more flow than the smaller VDO than it may be a great solution for those moderate 550-600ish whp applications where a huge 450L+ pump is not needed. When you start pumping a ton more fuel than needed, all you are doing is increasing a lot more fuel flow getting bypassed through the system which will further add to the heating up of the fuel in turn increasing the chance for fuel boiling and vapor lock. Nobody seems to be taking that into consideration. There comes a point of diminishing or negative returns I believe. Just because more fuel flow is better doesn't necessarily mean a LOT more flow will be even better yet. Some food for thought.. Also keep in mind that your pump will flow less volume when run with a 5.0 fpr vs a 3.8 fpr. That is why running injectors with 3.8 is always better than stock injectors with 5.0.

Bosch Motorsport also makes the 023 in tank pump that is physically the same size but pumps more fuel than the 040. Might be another good option to install into the factory basket.

Let's not forget that Porsche has used the 044 in line pump forever in most of their Motorsport applications over the years. Obviously a race proven set up used by a company with an unlimited R&D budget to do it however they see best. The 044 is actually designed by Bosch to be used in conjunction with the in tank 040. Being a fan of OEM, I'm leaning towards doing the 040/044 combo as employed by Porsche. Something to consider...

OEM 996TT pump


OEM 996TT pump with Bosch 040 retrofit Note how much bigger the Bosch 040 is compared to the OEM VDO.

 

i've always been told exactly that also. that the 044 pump is a good mid level upgrade, and will suit any car up to 600. i've never done it, but if/when i need another, that's what i will do.

 

Podigy mentioned that there was a single jet on the gt2's fuel system, but I think this is year dependent. My gt2 is a 2003, and didn't have a single pickup. (I'm the gt2 LQQK is refering to when he says he did a fuel system).

This is the reason for the flow increase... If the gt2's part number for the pump is different, its ONLY to categorize it. Its a standard pump- The jet system/basket is the only difference.

We dropped the walbro e85 450l/h pump in, and never looked back. 630whp right now and I'm not close to running out of fuel!

Edit: I have also been to a few track days with the new pump system, and have yet to notice any sign of fuel starvation...

 

How would the fuel get into the basket without a single jet pump???? You can not defy the laws of physics and have to have a means to lift the fuel from the tank to the basket. PET calls it the venturi tube and shows two versions, one for the GT2 and one for a TT. The TT version is split due to the two sponsons in the TT tank.

Did you upgrade the fuel lines or are you running stock lines. How about upgraded pump wiring with the Walbro?

 

The only fuel moving into the basket is the return line from the fuel rail. The rest comes in passively from suction at the bottom of the basket. On the GT2, the pump sits in a basket submerged at the bottom of the tank. Its not at the top up by the fuel fittings, its literally in a seprate basket. I'll post some pics.

I used a thicker gauge wiring for the pump, but it pretty much uses the same wiring as the OEM pump. I just spliced the wires. The stock lines are too small for the increased flow. I went to -6an fittings/tubing all the way to the rail, but left the oem line for the return fuel. I also removed the stock fuel filter and installed a fuel-lab one under the car, along with a check valve.

The pump is so quiet that when we tested it for the first time with a durametric, we thought we hooked something up wrong. However, a second later our Gatorade bottle was about to over-flow, so we knew something was right...

 

As Max said - he and I did the install on his 2003 gt2, with walbro 450 and 6an line to the fuel rail. Also installed fuel filter near gearbox. I didn't upgrade the wiring in his car at all.

Max - do you still have the photos. I think you posted them in dgreens thread a while back. I'll see if I can find it.

The basket was like the standard Carerra basket, and because of the flat bottom there is no jet pump. The fuel enters thru the bottom of the basket and the return line come back in the top. This stops surge.

 

Heres a couple:

 

As you can see, the two tubes are just to and from the rails, no recirculating.

Couple more pics:

 

LOL. Sorry this is your thread buddy. You come first. You can replace it with good fuel line and clamps. But they only split due to the line being old and hard then adding high fuel pressure. I will call you this week with the new option and help you sort it out!

 

Thanks. That's interesting. I wonder why PET shows the venturi pump for the GT2 then? I didn't think the GT2 basket sat at the bottom of the tank. but rather that it was attached at the top like the TT version. Hmmm..

Did you by any chance ever come across the pictures for the pump wiring off the battery?

Thank you...

 

on TT the basket locks to the tank in the middle over the hump. gt2 has no hump and basket locks to the bottom of the tank same way in the center ( twists on ) they are only attached to the top with fuel lines in both cars.

 

Perfect. Thank you...