Resolving HPFP corn woes (black death/sticking spill valve)

[Enki]

First off, no-one should get their hopes up. There is no guarantee that any of this will work.

That said, let's get to the meat of the thread.

Issues:
1. Sticky spill valve; thin brown residue not unlike the shit on post-it notes.

2. Black death; thick, sticky oil based crud.


Projected causes:
1. Fuel boiling off causing fuel to deposit residues on spill valve parts (and to a lesser extent, internals).

2. Oil seeping past the retaining nut seals (both of them) and coking up causing the internals to seize in a compressed state.


Projected fixes:
1. Non stick coating on moving and some non-moving spill/button valve parts.

2. New PTFE/Teflon scraper ring for the retaining nut, along with perhaps additional o-rings behind it.


Current status:
1. Jet-Hot sending me a sample (for FREE! because they are fucking awesome) of non-stick coating which I will boil in a decent amount of e85 to confirm two things:
A. The fuel boiling off is the cause of sticky film
B. The sticky film won't stick to the non-stick coating

2. Pending Phate lending me his spare retaining nut and/or purchase of new fuel pump (to use current as testbed); measurements will be taken for the PTFE scraper and o-ring clearance (which I might just fill up with Permatex or Right Stuff), and JBR graciously agreed to cut me a beta scraper ring for testing.

The guys making it all come together:
@phate for retaining nut (Delivered!)
@jbarone for custom-cut PTFE scraper (Specced out and awaiting fabrication!)


TLDR:
I'm so hopelessly addicted to corn I'm going to Frankenstein my pump which will either save the day or crush countless souls

@phate @Bucker @silvapain @rfinkle2