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154 Posts
This has been a long ongoing pita with my fuel issues. First the issue started when my primary passenger side pump died. Ran for 30 seconds and then would stall. Fixed it easily with a new oem pump. Drove it for a month without issue when I realized that the fuel pump to tank gasket was a one time use item. CEL for "large evap leak detected".
Purchased a new gasket for $12 at the dealer. Put it in this Sunday. CEL gone. Fires right up. I drive to the gas station right afterwards. Fill up and start the Touareg. After 30 seconds of idling it stalls out.
Luckily I was across the street from home. I walk home, get tools, and pull the passenger side pump thinking maybe the electrical connection is loose. Everything looks good so I inspect the pump in the tank. The female spade connection deep in the fuel pump itself came off of its connection. This requires bother pumps to be pulled out to remove the pump and reconnect the connection. I assemble everything and she fired right up. No issues, no CEL, no stalling.
She runs fine for 2 weeks when I need gas again. I put half a tank of fuel in. Starts up fine. Then stalls at 30 seconds.........
Without playing around I pull the fuel pump covers, inspect both connections, all external fuel fittings and use a stethoscope (I'm a medical resident) to listen to the priming pump and make sure that's good. It works properly, for 30 seconds, then turns off and the treg stalls shortly after.
I listen to the passenger pump at 31 seconds. Nothing. Doesn't turn on. So I unplug the passenger fuel pump. Start the treg and as soon as I hear the priming pump turn off, I plug in the passenger pump at 32 seconds. And it turns on........
Fuel gauge doesn't work when I had to do this. So, I turn off the treg. Restart it and I have fuel gauge, but again, it stalls at 30 seconds.
Once more, I pull the passenger plug. Start the treg. And plug pump in at 31 seconds. Works perfectly with no fuel gauge.
At this point I drive it home. Leave it home. And get a ride to work.
I'm thinking its a fuel pump relay. I'm essentially creating a negative feedback loop by unplugging/ plugging in the pump while the treg is running. I think. Tried to swap around the two 404 fuel relays. No difference at all.
Anyone ever hear of any such issue like this?!
Is it possibly I burned out a relay when the spade connection to the fuel pump inside the tank was loose and flopping around? Short the circuit?
Are there other fuel system relays I'm overlooking besides the two on the drivers side firewall?
Thank you!
Purchased a new gasket for $12 at the dealer. Put it in this Sunday. CEL gone. Fires right up. I drive to the gas station right afterwards. Fill up and start the Touareg. After 30 seconds of idling it stalls out.
Luckily I was across the street from home. I walk home, get tools, and pull the passenger side pump thinking maybe the electrical connection is loose. Everything looks good so I inspect the pump in the tank. The female spade connection deep in the fuel pump itself came off of its connection. This requires bother pumps to be pulled out to remove the pump and reconnect the connection. I assemble everything and she fired right up. No issues, no CEL, no stalling.
She runs fine for 2 weeks when I need gas again. I put half a tank of fuel in. Starts up fine. Then stalls at 30 seconds.........
Without playing around I pull the fuel pump covers, inspect both connections, all external fuel fittings and use a stethoscope (I'm a medical resident) to listen to the priming pump and make sure that's good. It works properly, for 30 seconds, then turns off and the treg stalls shortly after.
I listen to the passenger pump at 31 seconds. Nothing. Doesn't turn on. So I unplug the passenger fuel pump. Start the treg and as soon as I hear the priming pump turn off, I plug in the passenger pump at 32 seconds. And it turns on........
Fuel gauge doesn't work when I had to do this. So, I turn off the treg. Restart it and I have fuel gauge, but again, it stalls at 30 seconds.
Once more, I pull the passenger plug. Start the treg. And plug pump in at 31 seconds. Works perfectly with no fuel gauge.
At this point I drive it home. Leave it home. And get a ride to work.
I'm thinking its a fuel pump relay. I'm essentially creating a negative feedback loop by unplugging/ plugging in the pump while the treg is running. I think. Tried to swap around the two 404 fuel relays. No difference at all.
Anyone ever hear of any such issue like this?!
Is it possibly I burned out a relay when the spade connection to the fuel pump inside the tank was loose and flopping around? Short the circuit?
Are there other fuel system relays I'm overlooking besides the two on the drivers side firewall?
Thank you!