'19 FK8 - MPG and fuel gauge issues

[Highlander01]

Hi all,

I recently had the FK8 pump replaced with a Deatschwerks 300c 340LPH Compact Fuel Pump. The reason for this is because I've been getting a few P0087 fuel rail/system pressure low errors and the car just wont start and someone recommended I change the aforementioned part.

A local garage installed the pump today. No issues to begin with, MPG readings seemed find and the fuel gauge level read approx 2/3's of a tank left, which was correct.

Got back in the car later, after driving for a few minutes I noticed the fuel gauge had dropped to about 1/4 of fuel in the tank! The MPG readings on the dash was also dropping at an alarming rate, much much faster than when I had the OEM pump in.

The car has had a number of mods, which have been in installed in the car for about 2 years:

PRL HVI
PRL Inlet pipe
PRL Intercooler
Milltek Catback non-res

THe car had a basemap put on it Jan 2023.

Does anyone have any ideas? Is there something I need to do to 'reset' the fuel readings?

Thanks all

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[Romeoridgee]

have them take the pump assembly back out and make sure the float isnt touching anything. fuel gauge takes a minute to get proper readings.

 

[Highlander01]

have them take the pump assembly back out and make sure the float isnt touching anything. fuel gauge takes a minute to get proper readings.

Thanks. I disconnected the battery yesterday. Although the fuel range is still inaccurate (says I have have 50 miles left, on a full tank) the numbers aren't dropping at an alarming rate. The gauge is still broken:

 

[Highlander01]

Got it sorted. It was a cable from the pump that wasn’t connected properly and the float wasn’t operating properly.

Thanks for the advice, romeoridgee.

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