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E350 motorhome: I have a 2006 E350 motorhome.fuel gages keep…

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I have a 2006 E350...
I have a 2006 E350 motorhome.fuel gages keep saying low fuel. Put in a new.fuel pump last month and problem back again after I filled it up yeyesterday. Also, I been using 91 octane in or. Check engine light keeps coming on....diagnosis at auto zone says fuel/air ratio or cat convert...any suggestions
Submitted: 3 years ago.Category: RV
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Answered in 23 minutes by:
5/22/2015
RV Mechanic: Roy Belding, RV Mechanic replied 3 years ago
Roy Belding
Roy Belding, RV Mechanic
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what was the code???
as far as the fuel gauge, you may have an issue in the tank itself not allowing the float to move freely.
Roy
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Customer reply replied 3 years ago
Code. P0171. Before changed fuel pump had P0171, 0174 and 0463. Also, is 91 octane necessary in this...originally dealer said 87 but auto zone said to use 91.
Customer reply replied 3 years ago
Could problem possibly be bad computer? I have read some forums leading that direction
RV Mechanic: Roy Belding, RV Mechanic replied 3 years ago
ok, the 171,174 codes indicate lean condition. possible causes are vacuum leak, pcv valve bad, low fuel pressure. most common cause is a vacuum leak.
the 463 is a fuel level sensor code for high input. since you have replaced the module, I suggest checking wiring for and connections that are damaged or harness damage.
no it is not the computer yet.
Roy
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