Car dies when it gets to a quarter tank

[Stephen Semenchuk]

Looking for suggestions. I replaced both fuel pumps of my 2005 Cayenne Turbo after the main pump died. Got it all connected back up and she runs great.... until it gets down to a bit under a quarter tank. Sometimes the engine just quits, other times the throttle gets intermittently rough, it shudders however, if I feather the gas lightly, it will continue to drive, if I press harder on the gas, it stalls. When I pull over and restart it, it drives fine for about a mile or so then same thing. Has anyone experienced this after replacing the fuel pumps? Is there an installation “gotcha” that I missed? Thanks in advance for all your expert opinions.

[Mr.Flip]

When you changed both fuel pumps, did you change the fuel sending units as well, and just to make sure, did you hook up the sending unit transfer hose? Also where did you get the pumps from?


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[Stephen Semenchuk]

Thanks for the reply. No, I didn’t replace the fuel sending units. I’ll have to double check the sending unit hose connection as well. I got the fuel pumps from AutohausAZ.

[Mr.Flip]

Okay, AutohausAZ hasn't been known to have any faulty parts so a bad fuel pump is unlikely. I'm leaning more towards the sending unit. When you fill up full from a quarter tank is it about 20 gallons? And before buying anything else I'd just double check the connections to make sure.


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[Stephen Semenchuk]

Yes, a fill up from a quarter tank and s around 20 gallons. I’ll double check the connections this weekend. Thanks for the suggestions.