PSA for anyone with a Boundary oil pump
 

First off let me say that it's nice to have a company that will build you a bulletproof pump. However, after I built my engine I noticed a small oil leak from the pump. After investigation it was the Allen head plug that seals the high pressure port. Boundary doesn't use the correct plug, and they don't use sealant. Mine was leaking. I took the OEM plug out of my old pump and it's tapered where the one boundary gives you is not. Installed the oem plug with liquid Teflon, and viola no more leak. Hope this helps someone building an engine, check this plug before you install it.

I also noticed on shibby's car that the threads felt parallel, which could keep tightening until it was recessed in the housing.

Thanks for the heads up.


@Shibby oil drops?

1/4" npt?

Yessir that's exactly it, the plug boundary gives you is just straight threaded the OEM is pipe thread I believe . You might get sealing with the boundary plug if you use sealant

I believe so, the plug head OEM is 1/4" hex, the boundary plug is 6mm. Not 100% on the thread pitch

This is what you're referring to right?

https://cimg2.ibsrv.net/gimg/www.mia...59fb6cf5b2.jpg

yessir

Good to know I'll have to vehck mine

It'd be really weird if they shipped with a set screw instead of a tapered threaded plug. If BE keeps the stock thread size, it's actually 1/4BSPT, which may look straighter if you're comparing to a 1/4" NPT. There is such a thing as BSPP, parallel threads, but they require an O-ring to seal, so I can't imagine they'd even make BSPP plugs.

I don't have a side by side picture but I can tell you whatever BE sends you keeps threading in never seems to tighten, the OEM plug definitely gets tight and it's tapered. The BE plug definitely leaks pretty bad.

Mine was loose too. Used the BE plug but with sealant. And tighten.

NPT and BSPT are the same taper angle, 1" diameter per 16" of length. The threads are different, though.

Just pulled my NIB pump out of the box and confirmed I have the same plug based on appearance alone. Pump has not been removed from the bag yet.

I would pull the plug off your old OEM pump and reinstall on the BE pump with Teflon paste and win at life

Sure, why would anyone think the only 2 parts (plug + seal), other than the gear that were replaced could possibly be sub-standard.

Totally man it makes ZERO sense. I love the pump but I mean WHY use a shitty crank seal and some random plug? Makes no sense to me at all

Likely it is done by their supplier to save money without letting Boundary know. Either that or they were told "It'll work and save money"

I have a question while this post is about the plug. I got my Boundary oil pump and I was cranking the motor to get oil pressure prior to the first startup and I received none! I looked at my oil filter, no oil. I looked at my pump and the screw or "plug" is threaded down in the pump a good amount. I'd say probable close to half an inch. I was wondering if this plug prevents oil from traveling down the channel or what. Could this be why I have no oil pressure? If so PLEASE leave a reply. If all I have to do to get oil pressure is loosen a screw, I will be so happy. Thanks :)

I don't see how that plug could be your issue, but I couldn't build enough pressure with the starter to register pressure on my OEM dummy gauge.

How are you measuring oil pressure?

I assume you are talking about the plug on the left side of the pump right to the side of the alternator? What I suggest doing is removing the plug, putting a long funnel in, then pouring oil down it until it starts to come out the plug hole. Then put in the plug, remove spark plugs and unhook injectors. Spin the motor with a battery charger on it until you build oil pressure.