Inside a suction jet pump. Sometimes I think it's a sickness which afflicts Audi engineers.

Eric 2.7 · 05-24-2004, 06:26 PM

Here is a partial view of the inside of the problematic suction/jet pump. The straight connection on the left comes from the brake booster. The connection on the right goes to the manifold (vac source). The branch comes from the junction can for the breather system.

The two orange circles are rubber diaphram check valves. Vacuum pulls through two paths. One straight through and the other through the venturi side. The venturi side pulls vacuum from the branch trading velocity for vacuum level (? why ?). So here it is. WTF, mates.

Keep in mind that this animal only exists on certain models (Tips 2000, and I forget how far beyond).

2.7tDallas REFORMED · 05-24-2004, 06:29 PM

then hwat happens?

Eric 2.7 · 05-24-2004, 06:41 PM

system while the larger bore side stays operational and keeps pulling from the brake booster as required.

The two halves are isolated completely from each other, and there are plenty of small clearances on the branch side to get gummed up.

I'd still like to figure out if I can just eliminate this puppy and connect the can directly to the manifold.

saabSean · 05-24-2004, 07:18 PM

NJ4.2GUY · 05-24-2004, 09:12 PM

is that gonna go on mine too?

StoneMan · 05-24-2004, 09:50 PM

Jeez, and you'd THINK it would be Audi related!

Eric 2.7 · 05-25-2004, 04:15 AM

JimR · 05-25-2004, 05:46 AM

**Kris Hansen** · 05-25-2004, 06:27 AM

Eric 2.7 · 05-25-2004, 06:37 AM

05-24-2004, 06:26 PM	#1
Eric 2.7 Member Account #: 61325 Join Date: Aug 2003 Posts: 2,808	Inside a suction jet pump. Sometimes I think it's a sickness which afflicts Audi engineers. Here is a partial view of the inside of the problematic suction/jet pump. The straight connection on the left comes from the brake booster. The connection on the right goes to the manifold (vac source). The branch comes from the junction can for the breather system. The two orange circles are rubber diaphram check valves. Vacuum pulls through two paths. One straight through and the other through the venturi side. The venturi side pulls vacuum from the branch trading velocity for vacuum level (? why ?). So here it is. WTF, mates. Keep in mind that this animal only exists on certain models (Tips 2000, and I forget how far beyond). __________________ Eric 2000 A6 2.7T DIY Mule: Full Timing Belt Replacement, Cam Seals & Cam Tensioner Gaskets, Engine Mounts (TWICE! Thanks Hamburg-Technic/ECS), O2 Sensors, 2ndary Coolant Pump, '03 OEM Sport Suspension, H-Sport Sway Bars, Control Arms, Tie Rod Ends, CV Joint Boots & All Kinds of Maintenance Stuff. Retired: 1996 A4 2.8 2wd 12v 1987 4000CS Quattro 1980 4000 2door (not even an "S")

05-24-2004, 06:29 PM	#2
2.7tDallas REFORMED Junior Member Account #: 71945 Join Date: Mar 2004 Posts: 1,515	so when it gums up - the brake booster calls for mor vac to operate then hwat happens?

05-24-2004, 06:41 PM	#3
Eric 2.7 Member Account #: 61325 Join Date: Aug 2003 Posts: 2,808	I'm thinking the branch/venturi side becomes clogged eliminating that pull on the breather system while the larger bore side stays operational and keeps pulling from the brake booster as required. The two halves are isolated completely from each other, and there are plenty of small clearances on the branch side to get gummed up. I'd still like to figure out if I can just eliminate this puppy and connect the can directly to the manifold. __________________ Eric 2000 A6 2.7T DIY Mule: Full Timing Belt Replacement, Cam Seals & Cam Tensioner Gaskets, Engine Mounts (TWICE! Thanks Hamburg-Technic/ECS), O2 Sensors, 2ndary Coolant Pump, '03 OEM Sport Suspension, H-Sport Sway Bars, Control Arms, Tie Rod Ends, CV Joint Boots & All Kinds of Maintenance Stuff. Retired: 1996 A4 2.8 2wd 12v 1987 4000CS Quattro 1980 4000 2door (not even an "S")

05-24-2004, 07:18 PM	#4
saabSean Member Account #: 8108 Join Date: Jul 2000 Posts: 4,434	We've got them on '99 2.8s __________________ AudiWorld \|\| 1999 A6 2.8q \| 1992 100CS \| AudiWorld Photo Gallery Links \|\| Stoney's FAQ \| CycleForums European Sportbikes Forum Tech Articles \|\| Instrument Cluster Replacement \| Suction Pump Replacement Other \|\| boompa.com/audiSean FOR SALE: MOVEN SP-10 18X8.5 FORGED WHEELS, $500 for 5

05-24-2004, 09:12 PM	#5
NJ4.2GUY Junior Member Account #: 73864 Join Date: Apr 2004 Posts: 671	I have a 2000 4.2 is that gonna go on mine too?

05-24-2004, 09:50 PM	#6
StoneMan Senior Member Account #: 47743 Join Date: Dec 2002 Posts: 7,210	Pic got P0wned! Jeez, and you'd THINK it would be Audi related! __________________

05-25-2004, 04:15 AM	#7
Eric 2.7 Member Account #: 61325 Join Date: Aug 2003 Posts: 2,808	Hey AWMODS, this is a part from an A6 - Audi Related. __________________ Eric 2000 A6 2.7T DIY Mule: Full Timing Belt Replacement, Cam Seals & Cam Tensioner Gaskets, Engine Mounts (TWICE! Thanks Hamburg-Technic/ECS), O2 Sensors, 2ndary Coolant Pump, '03 OEM Sport Suspension, H-Sport Sway Bars, Control Arms, Tie Rod Ends, CV Joint Boots & All Kinds of Maintenance Stuff. Retired: 1996 A4 2.8 2wd 12v 1987 4000CS Quattro 1980 4000 2door (not even an "S")

05-25-2004, 05:46 AM	#8
JimR Member Account #: 1018 Join Date: Mar 2000 Posts: 46,941	FWIW - the parts and service guys at my local dealer call that a "suck pump". __________________ JimR '07 A3 3.2q Lava Gray '99 A8 4.2q Pearl White '99 A6 Avant 2.8q Silver (My old car, son now drives) '06 Boxster S Guards Red (wife's wheels) Support the troops "Over the years, I have come to understand a critical difference between the world of fear and the world of freedom. In the former, the primary challenge is finding the inner strength to confront evil. In the latter, the primary challenge is finding the moral clarity to see evil."

05-25-2004, 06:27 AM	#9
Kris Hansen Chief of Goat control Account #: 20 Join Date: Oct 2000 Posts: 66,548,190	*Well, it does* suck!! :-)**

05-25-2004, 06:37 AM	#10
Eric 2.7 Member Account #: 61325 Join Date: Aug 2003 Posts: 2,808	I don't see it on ETKA for a 4.2 so i think you are in the clear. __________________ Eric 2000 A6 2.7T DIY Mule: Full Timing Belt Replacement, Cam Seals & Cam Tensioner Gaskets, Engine Mounts (TWICE! Thanks Hamburg-Technic/ECS), O2 Sensors, 2ndary Coolant Pump, '03 OEM Sport Suspension, H-Sport Sway Bars, Control Arms, Tie Rod Ends, CV Joint Boots & All Kinds of Maintenance Stuff. Retired: 1996 A4 2.8 2wd 12v 1987 4000CS Quattro 1980 4000 2door (not even an "S")

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