HPFP internal seal doesn't look so good...

[hnda etr]

Originally Posted by himurax13 hnda etr has some of plunger seals. He could sell you some.

Originally Posted by Etipp98 I have used these in about 10 pump with no issues, direct fit.

Yeah i have a shit load of them cuz they only sell in packs of 100 and 50

McMaster-Carr part numbers:
90025k135 = Buna material (Standard OEM)
6540K121 = Viton material (Upgrade over Buna)

They're called Quad-Rings, X-rings or Double-seal O-Rings

[crutch77]

Originally Posted by hnda etr Yeah i have a shit load of them cuz they only sell in packs of 100 and 50 McMaster-Carr part numbers: 90025k135 = Buna material (Standard OEM) 6540K121 = Viton material (Upgrade over Buna) They're called Quad-Rings, X-rings or Double-seal O-Rings

I got the rings yesterday, thanks again! Unfortunately the quad ring was apparently not the problem. Add me to the KMD haters group. My internals still look brand new, I am 100% confident that there are no installation issues, and my fuel pressure is still dropping at WOT.

So what now? I bought a set of Autotechs (bonus on timing this with the Black Friday sale, I guess). I have replaced the quad seal and the largest o-ring on the outside of the HPFP assembly. Just to cover all my bases, I'd like to replace the other o-ring: the one on the outside of the 18mm nut assembly. Does anyone know the size or have a McMaster Carr number for that o-ring? I haven't been able to find it searching these forums.

I'd also like to replace the spring if possible. Corksport is including a stiffer spring in their kits when they start selling them, but they won't sell the spring separately. I haven't hit up cp-e yet to see if they will, but I'm not optimistic. Anyone know a source for this spring? At 79,000 miles, my spring may be fatigued.

[hnda etr]

Originally Posted by crutch77 I got the rings yesterday, thanks again! Unfortunately the quad ring was apparently not the problem. Add me to the KMD haters group. My internals still look brand new, I am 100% confident that there are no installation issues, and my fuel pressure is still dropping at WOT. So what now? I bought a set of Autotechs (bonus on timing this with the Black Friday sale, I guess). I have replaced the quad seal and the largest o-ring on the outside of the HPFP assembly. Just to cover all my bases, I'd like to replace the other o-ring: the one on the outside of the 18mm nut assembly. Does anyone know the size or have a McMaster Carr number for that o-ring? I haven't been able to find it searching these forums. I'd also like to replace the spring if possible. Corksport is including a stiffer spring in their kits when they start selling them, but they won't sell the spring separately. I haven't hit up cp-e yet to see if they will, but I'm not optimistic. Anyone know a source for this spring? At 79,000 miles, my spring may be fatigued.

No problem. Protegegarage.com used to sell upgraded hpfp springs, but I don't see them on their site any more. You might try them to see where they sourced them from.

[crutch77]

Originally Posted by hnda etr No problem. Protegegarage.com used to sell upgraded hpfp springs, but I don't see them on their site any more. You might try them to see where they sourced them from.

Thanks for the tip, I just emailed them. Do you have a part number for the large o ring you sent me?

[hnda etr]

Originally Posted by crutch77 Thanks for the tip, I just emailed them. Do you have a part number for the large o ring you sent me?

No sorry. That actually came from Brydon at Corksport. He sent a couple to me.

[crutch77]

Originally Posted by hnda etr No sorry. That actually came from Brydon at Corksport. He sent a couple to me.

Nice! Do you think Brydon might be willing to help us out with the other o-ring (the mid-sized one that goes on the 18mm nut assy) and maybe even a spring? The random person I got with Corksport customer service was not inclined to help...

[hnda etr]

Originally Posted by SFWD 1934 hnda etr; Is this the one you have? I must be blind because I did not see it 6540K121 Double seal viton fluoroelastomer Cross reference over to Grainger as: 3CRT2 (pack of 5) for $10.63 Also found them at: ww.theoringstore.com for .36 cents each for 1-24, 0.18 cents for 25-99 (that is the QR NBR (nitrile rubber). These are in inner small o ring that the piston shaft makes contact with. Let me measure and verify the outer o ring that is on the 18MM hat. Jason

In the below post # 18

Originally Posted by hnda etr Yeah i have a shit load of them cuz they only sell in packs of 100 and 50 McMaster-Carr part numbers: 90025k135 = Buna material (Standard OEM) 6540K121 = Viton material (Upgrade over Buna) They're called Quad-Rings, X-rings or Double-seal O-Rings

[MS3NOOBIE]

Originally Posted by hnda etr Yeah i have a shit load of them cuz they only sell in packs of 100 and 50 McMaster-Carr part numbers: 90025k135 = Buna material (Standard OEM) 6540K121 = Viton material (Upgrade over Buna) They're called Quad-Rings, X-rings or Double-seal O-Rings

I’m having the same problem.

[MSMS3]

Originally Posted by MS3NOOBIE I’m having the same problem.

You have another problem: Trying to activate a four year old dead thread. People in that thread are no longer following it and probably don’t even own their cars anymore. Best to start a new thread.

Most auto parts stores carry a wide variety of o-rings. Just take your pump in and get them to match up the o-rings to your old ones. Ain’t rocket science.