Billet HPFP Cap Install
I wanted to do a writeup / review on this since I was not able to find much information about this install online or on facebook, except for some help that Daniel from DBV2 gave me (Thanks!).
First, why did I install this? My car is stage 2 91, stock pumps, so there is not much reason I need to upgrade my fuel flow. However, in the future, I want to go vortex and MPI, so there is some benefit to doing this upgrade while it's on sale. Mostly though, it is an aesthetic / reliability mod. AN connections are awesome and they look cool, as do billet parts.This mod also allowed me to do custom-ish fuel lines, which will have another write up soon.
Performance wise, I expect that this piece would help optimize a DI setup. The oem cap is really tiny, and the inlet is only 0.185” diameter. TINY. Then, the smart folks in Wolfsburg put a 6 micron filter inside with a brass ring to make the diameter even smaller. I don't understand how 400 hp worth of fuel could ever flow through there.
The quality of the stainless piece is outstanding. I didn’t see a single tooling mark or imperfection on mine. I might get it anodized later down the road. I can tell that the material is very high quality.
First step, jack up your car.
Then, use a 46mm socket (deep) and a breaker bar to remove the stock cap. I did mine with the pump on the car. Fuel will spill out when you remove the cap.
Next, is the tricky part. You have to remove the internal plate and ring from the oem cap and install them in the new cap. Best way to do this is to make a cut in the cap and then stick something in the top and push it out with an arbor press. I used an angle grinder and then a dremel to cut open the cap. Band saw would be better. You could also get a spare cap to cannibalize. I heard that Audi A4 pumps have two plates so you can mess one up.
Pressing the plate and ring into the new cap was not super easy. You have to find something that is exactly the right size. I eventually found a socket that did the trick to seat it completely in.
In this process, you are going to break the fuel filter inside the oem cap, no way around it. DBV2 told me that installing a replacement was not necessary, but I don’t know how this could be true for such high-precision GDI parts. The OEM HP filter is *supposedly* 6 micron. Bosch says you should use a 10 micron for their port injectors, and 5 for direct injectors..I chose to install a 10 micron inline filter from SpeedFlow.
To reinstall, torque the cap to 200 Nm. I didn’t use any teflon tape, since there was none on the stock piece and they include a copper crush washer.
Until I saw a random post in the EQT facebook page, I had no idea that most of this stuff was necessary, so I wanted to pass the info along. Photo creds to DBV2.
So far, my car is running just fine. I have been watching like a hawk for leaks, and none so far. The an lines with this fuel pump cap look really nice, and I know they will be helpful when I get my E-tune / big turbo.
Billet cap:
https://www.dbv2.com/collections/volkswagen/products/dbv2-mqb-hpfp-cap
Filter:
https://www.maperformance.com/products/speedflow-short-series-6an-inline-filter-sf-601-010-06-blk
Another offering:
https://www.afrautoworksstore.com/products/afr-billet-hpfp-cap-golf-r-gti-audi-s3
I wanted to do a writeup / review on this since I was not able to find much information about this install online or on facebook, except for some help that Daniel from DBV2 gave me (Thanks!).
First, why did I install this? My car is stage 2 91, stock pumps, so there is not much reason I need to upgrade my fuel flow. However, in the future, I want to go vortex and MPI, so there is some benefit to doing this upgrade while it's on sale. Mostly though, it is an aesthetic / reliability mod. AN connections are awesome and they look cool, as do billet parts.This mod also allowed me to do custom-ish fuel lines, which will have another write up soon.
Performance wise, I expect that this piece would help optimize a DI setup. The oem cap is really tiny, and the inlet is only 0.185” diameter. TINY. Then, the smart folks in Wolfsburg put a 6 micron filter inside with a brass ring to make the diameter even smaller. I don't understand how 400 hp worth of fuel could ever flow through there.
The quality of the stainless piece is outstanding. I didn’t see a single tooling mark or imperfection on mine. I might get it anodized later down the road. I can tell that the material is very high quality.
First step, jack up your car.
Then, use a 46mm socket (deep) and a breaker bar to remove the stock cap. I did mine with the pump on the car. Fuel will spill out when you remove the cap.
Next, is the tricky part. You have to remove the internal plate and ring from the oem cap and install them in the new cap. Best way to do this is to make a cut in the cap and then stick something in the top and push it out with an arbor press. I used an angle grinder and then a dremel to cut open the cap. Band saw would be better. You could also get a spare cap to cannibalize. I heard that Audi A4 pumps have two plates so you can mess one up.
Pressing the plate and ring into the new cap was not super easy. You have to find something that is exactly the right size. I eventually found a socket that did the trick to seat it completely in.
In this process, you are going to break the fuel filter inside the oem cap, no way around it. DBV2 told me that installing a replacement was not necessary, but I don’t know how this could be true for such high-precision GDI parts. The OEM HP filter is *supposedly* 6 micron. Bosch says you should use a 10 micron for their port injectors, and 5 for direct injectors..I chose to install a 10 micron inline filter from SpeedFlow.
To reinstall, torque the cap to 200 Nm. I didn’t use any teflon tape, since there was none on the stock piece and they include a copper crush washer.
Until I saw a random post in the EQT facebook page, I had no idea that most of this stuff was necessary, so I wanted to pass the info along. Photo creds to DBV2.
So far, my car is running just fine. I have been watching like a hawk for leaks, and none so far. The an lines with this fuel pump cap look really nice, and I know they will be helpful when I get my E-tune / big turbo.
Billet cap:
https://www.dbv2.com/collections/volkswagen/products/dbv2-mqb-hpfp-cap
Filter:
https://www.maperformance.com/products/speedflow-short-series-6an-inline-filter-sf-601-010-06-blk
Another offering:
https://www.afrautoworksstore.com/products/afr-billet-hpfp-cap-golf-r-gti-audi-s3