| Author |
Message |
hazetguy
Samba Member
Joined: April 06, 2001
Posts: 10773
Location: iT StiNgeD iTseLf tO dEAd
|
 Posted: Fri Jun 22, 2018 11:26 am Post subject: EMPI "ICT" Dumping Fuel / Popping. Advice needed |
 |
|
I could use some help diagnosing a carb / fuel / backfiring/ popping issue.
Type 4 engine (I think it's a 2L), solid lifters.
-recent valve adjust
-009 distributor, advance mechanism working properly, timing set to 32* at high rpm
-pertronix ingition. not super thrilled about the module on the shaft, it seems a bit "loose" or "wobbly", not a nice tight press fit.
The carbs are EMPI (yes, I know, kill me now) copies of Weber 34ICT. They are pretty new, don't have a lot of miles on them.
The carbs seem to be dumping raw fuel at higher rpms, through the center. Please watch the first video. I have been told everything from "that is normal" to "junk those carbs and get some Kadrons (not exceptionally helpful in this situation). There also seems to be popping / backfiring through the carb as this occurs.
I pulled the top of the carb off. Needle and seat are functioning properly. Float is not stuck. Idle mixture screws were set to factory spec (2.5ish turns out).
My initial thought was that the fuel pressure was too high. It tested at just under 5psi. A pressure regulator (dial type) and gauge were installed. Please see the second video.
Any words of expertise would be greatly appreciated. I am not that well versed in dual carbs. Trying to eliminate the popping, and to know if that fuel delivery is how it's "supposed to be" or not, and how to remedy it if it's not.
Is that (non vaporized) fuel delivery through the center of the carb "normal"?
Pressure readings look acceptable?
Any other things to check, recheck, or verify would be helpful.
Thanks a lot.
Dumping raw fuel through center at higher rpms:
Link
Pressure gauge readings:
Link
_________________
thebucket: I invested in hoodride, now DBD won't return my call?
hazetguy: invested?
thebucket: Yeah Haze, its where people put money into a company in hopes of a return on their money |
|
| Back to top |
|
 |
[email protected]
Samba Member
Joined: August 03, 2002
Posts: 12785
Location: Salt Lake City, Utah
|
| Posted: Fri Jun 22, 2018 12:05 pm Post subject: Re: EMPI "ICT" Dumping Fuel / Popping. Advice needed |
|
|
that's not a fuel pressure regulator. It's chit. Get a good one, and get your $ back, you got suckered.
_________________
It's just advice, do whatever you want with it!
Please do NOT send me Private Messages through the Samba PM System (I will not see them). Send me an e-mail to john at aircooled dot net
"Like" our Facebook page at
http://www.facebook.com/vwpartsaircoolednet
and get a 5% off code for use on one order for VW Parts ON OUR PARTS STORE WEBSITE, vwparts.aircooled.net |
|
| Back to top |
|
|
air-h2o-air
Samba Member
Joined: January 25, 2015
Posts: 579
|
| Posted: Sat Jun 23, 2018 8:30 pm Post subject: Re: EMPI "ICT" Dumping Fuel / Popping. Advice needed |
|
|
| 3 psi max! Used dozens of these, never had any issues....are floats set at 10mm? If not, set them |
|
| Back to top |
|
|
Danwvw
Samba Member
Joined: July 31, 2012
Posts: 8892
Location: Oregon Coast
|
| Posted: Sat Jun 23, 2018 10:25 pm Post subject: Re: EMPI "ICT" Dumping Fuel / Popping. Advice needed |
|
|
Looked at your video looking into the carb. Yes it's float level is too high or the float is hanging up. Remove the carb clean things up and play with it make sure the float is free to move and that the needle valve works, shuts off the air when you blow on the fuel inlet. Make sure the float is good. If the fuel pressure is over 3 lbs it may have a problem with that but really the float level could be adjusted lower and this would stop that. Carbs need to operate at float levels just below where that happens.
Mine had a lot more stable fuel pressure. Looks like a mechanical pump they jump a bit like that. It could be a problem with the fuel pump making it jump so much. Set the pressure for a max of 2.5 lbs. But yeah, it could be the fuel pump jumping the pressure too much causing the needle valve to over flow it.
_________________
1960 Beetle And 1679cc DP W-100 & Dual Zeniths! |
|
| Back to top |
|
|
rockurob
Samba Member
Joined: August 23, 2009
Posts: 358
Location: Okla City, Oklahoma
|
|
| Back to top |
|
|
Danwvw
Samba Member
Joined: July 31, 2012
Posts: 8892
Location: Oregon Coast
|
| Posted: Sun Jun 24, 2018 1:51 pm Post subject: Re: EMPI "ICT" Dumping Fuel / Popping. Advice needed |
|
|
| rockurob wrote: |
a few years ago I purchased a new set of the empi epc 34s
must have proper fuel pressure
must have proper float adjustment height
but the third thing I found …. the neoprene needle/seat combo
was not holding the pressure
I resolved by using a Weber all brass needle/seat for both carbs |
Bet this is the problem here too. Well and maybe that jumpy fuel pressure, mine was jumping around a lot worse and I took the top off the fuel pump and found the problem was in the brass check valve that had fallen apart:
_________________
1960 Beetle And 1679cc DP W-100 & Dual Zeniths! |
|
| Back to top |
|
|
|
