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Clyde Maddox
Samba Member
Joined: January 09, 2005
Posts: 31
Location: Athens, Ga.
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 Posted: Fri Dec 03, 2021 3:48 pm Post subject: Re: Gas in the Oil - 72’ FI/Auto |
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The back seat relay only clicks with the key.
The ecu only has a bosch foil sticker: 0 280 000 019. No stamping. Pressure switch is 031B.
There is a spare ecu stamped 311 906 021B. Is there a compatibility chart somewhere?
And you’re saying that wire 17 doesn’t matter? It has no continuity.
And I blew through the return line with about 15psi, toward the tank. Happy bubbles. Pressure still bleeds off instantly when key is turned off.
What does btdt mean? |
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Clyde Maddox
Samba Member
Joined: January 09, 2005
Posts: 31
Location: Athens, Ga.
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| Posted: Fri Dec 03, 2021 3:53 pm Post subject: Re: Gas in the Oil - 72’ FI/Auto |
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| And if I unplug all injectors, it holds 30 psi after key is off. |
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Mike Fisher
Samba Member
Joined: January 30, 2006
Posts: 17970
Location: Eugene, OR
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| Posted: Fri Dec 03, 2021 4:32 pm Post subject: Re: Gas in the Oil - 72’ FI/Auto |
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| Clyde Maddox wrote: |
The back seat relay only clicks with the key.
The ecu only has a bosch foil sticker: 0 280 000 019. No stamping. Pressure switch is 031B.
There is a spare ecu stamped 311 906 021B. Is there a compatibility chart somewhere?
And you’re saying that wire 17 doesn’t matter? It has no continuity.
And I blew through the return line with about 15psi, toward the tank. Happy bubbles. Pressure still bleeds off instantly when key is turned off.
What does btdt mean? |
It means Been There Done That. My '69 FI/AT square had a plugged return line, when my oil had gasoline in it.
You should blow air through in the opposite direction toward the engine.
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69 FI/AT square Daily Driver
66 sunroof,67,70,71,71,71AT,72,72AT,73 Parts
two 57 oval ragtops sold
'68 Karmann Ghia sold
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KTPhil 
Samba Member
Joined: April 06, 2006
Posts: 34022
Location: Conejo Valley, CA
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| Posted: Fri Dec 03, 2021 4:50 pm Post subject: Re: Gas in the Oil - 72’ FI/Auto |
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| Clyde Maddox wrote: |
| And if I unplug all injectors, it holds 30 psi after key is off. |
Okay, this is telling.
Stuck injectors that can bleed gas will bleed whether the electrical plug is in our out.
Your only bleed (open) when the wires are connected. This indicates either incorrect wiring or a defective ECU. |
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KTPhil
Samba Member
Joined: April 06, 2006
Posts: 34022
Location: Conejo Valley, CA
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| Posted: Fri Dec 03, 2021 4:52 pm Post subject: Re: Gas in the Oil - 72’ FI/Auto |
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| Clyde Maddox wrote: |
The ecu only has a bosch foil sticker: 0 280 000 019. No stamping. Pressure switch is 031B.
There is a spare ecu stamped 311 906 021B. Is there a compatibility chart somewhere?
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The '72 has no pressure switch.
Here is a FI parts table:
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Clyde Maddox
Samba Member
Joined: January 09, 2005
Posts: 31
Location: Athens, Ga.
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| Posted: Sat Dec 04, 2021 7:22 am Post subject: Re: Gas in the Oil - 72’ FI/Auto |
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The spare ecu allows it to hold fuel pressure with key off, and brought it to life. And made a 5' diameter fuel puddle behind the tail pipe  .
It's a step in the right direction. |
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Bobnotch
Samba Member
Joined: July 06, 2003
Posts: 22431
Location: Kimball, Mi
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| Posted: Sat Dec 04, 2021 2:21 pm Post subject: Re: Gas in the Oil - 72’ FI/Auto |
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| Clyde Maddox wrote: |
The back seat relay only clicks with the key.
The ecu only has a bosch foil sticker: 0 280 000 019. No stamping. Pressure switch is 031B.
There is a spare ecu stamped 311 906 021B. Is there a compatibility chart somewhere?
And you’re saying that wire 17 doesn’t matter? It has no continuity.
And I blew through the return line with about 15psi, toward the tank. Happy bubbles. Pressure still bleeds off instantly when key is turned off. |
I'm wondering if the PO (Previous Owner) converted the FI system to a "B" version used in 69, which is why some of the 72 stuff isn't there. This kind of stuff happens on 49+ y.o. vehicles over their lifetime. A mix and match of parts isn't the way to get it to work correctly, as these cars like ALL of their FI parts to match.
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http://www.thesamba.com/vw/forum/viewtopic.php?t=249390 -been busy working
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