Empi HPMX Roll Pin Fuel Leak??

[dentfreeimage]

Hello everyone, I am having issues with an EMPI HPMX 40 carb leaking fuel out of the side roll pin near the inlet for the fuel line. I have two questions, the first one is how can I repair this leak? I tried JB weld with no luck, I believe this was because I still had fuel in the carb, not letting the epoxy fully cure.. The carb is a little over a year old and is out of warranty, I got it from car craft and they will not take it back.

The second issue I'm having is that this has happened before twice on the same carb and car craft is telling me they have never heard of this before that many times.
I am running an electric pump with Holley regulator and gauge reading 2 3/4 psi and equal lenght of line going to each carb.

What makes me think, is that this has only happened to the right side carb, can it be a coincidence and the carbs have been at fault? Or is the fuel gauge at fault?
I greatly appreciate the advice!

[young55961]

Happened to me a few weeks ago. Called EMPI, they ship me a new top plate.

[dentfreeimage]

Wow, EMPI is telling me that they will work with me but Car Craft has to send it to them, not me. Car Craft gave up on helping me since it happened twice in less than 2 years and they took care of it. Carbs run great but have been a headache with these fuel leaks.
I am stuck now!

[modok]

Drill it, thread a screw into it, pull it. Measure the hole. Make a plug out of aluminum with a slight taper, same size as hole tapering up to .001 bigger, apply locktite, drive in hole.

[young55961]

In fact, I did use JW Weld Steek Stick before, work good.

You need to take the plate out , clean it with acetone. Apply it. Wait at least one day. If it still leak, add another patch.

I prefer rotary , always 3.5 PSI. No need regulator.

[dentfreeimage]

Thank you guys for the advice! If I had easy access to a machine shop that will make a new plug for it, I would definitely go that route but I don't have it. They will not do it around here unless you are paying big. I do have the JB weld stick and may go that route this weekend. I defiantly need to remove the top and clean it good before applying the jb weld.

[modok]

you don't need a whole machine shop, but aluminum rod near the needed size, a set of number drills, electric drill, and a file, hack saw, dial calipers.
It's fine if you don't want to fix it too, but you post here I assume you want to fix it

[dentfreeimage]

Definitely Glen, I will like to fix it the right way! Can I find the aluminum rod at home depot?
Thanks for the help.

[FeelthySanchez]

Probably. Advise us of the plug's diameter?
Could possibly also use a tiny scrap of tig welding rod - ask a buddy with weld experience to help ya out here.

[dentfreeimage]

Sounds good. I saw a YouTube video the other day and they were brazing a radiator using a harbor freight aluminum rod and a hand torch. It made me wonder if I can remove the float and fill in that area using the same method. It did not took much for the rod to melt. Even tho Glenn's advice is what I will follow, just need to find the rod to make the new plug.

[MURZI]

Just drill it and tap it. Shove a Allen head set screw in there with locktite thread sealant. 3.5 minute job.
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[dentfreeimage]

Great advice Murzi, by any chance do you recommend a specific size? It will help me knowing what size to look for. Thanks!

[modok]

You can use brass too, it doesn't have to be aluminum. Yeah the local hardware store here sells 1/4 aluminum rod, also brass rods.
1/16 pipe plug MIGHT work if the size matches up, but IMo it's more work

I've tried the aluminum brazing a few times and it KINDA works, but, it usually won't work right on any type of cast material.

The set of number drills can be used to gauge the size of the hole.
Take an inch length of material and spin it and file it down. Probably will taper itself even if you didn't intend it. Cut it off at a spot that's the right size and then you have "machined" a plug, and you can drive it in and cut off the excess

I don't know what size it is being a bit less than 1/4", could be wrong, don't take my word for it

[SamT]

JB weld will hold up excellent to gas.

I had a pair of Weber 40's a guy sold me for $100 because he broke one of the float holders off. Over a few days I built a new one out of JB weld and then drilled a hole for the hanger rod. Worked great for the 4 years we had the car. Maybe it's still running somewhere! Wish I had a picture of it that was sure an interesting repair.
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[dsrtfox]

I would take the top off and take it to ACE hardware. You usually have to know something to work at ACE unlike the dummys at the big box stores. If you find the right guy he'll be able to sell you a drill, a tap and set screw.

[MURZI]

[fuguboy]

What is a good gasoline resistant sealer ,is locktite resistant to gasoline??same plug is leaking on my hpmxxxx🤯xxxx

[mcdragracer]

I have fixed many, this is a common problem I've been
seeing with these carbs, easy fix is to tap and use an allen
head grub screw with red locktite.

[fuguboy]

I think it’s the ethanol in the gas and Empi is using snot to seal the plug. 💩

[mark tucker]

many times you can just tap the plug a few thou deeper. most all of them leek/seep some.I always epoxy the ones on the circuits, not just for fuel leeching out but sucking air in and changing the mixture. we were doing this 30+ years ago with american carbs... if you tap them bee skeerful dong it. also I would never use a aluminum thread in plug in a aluminum peice.use brass .