Oh-oh... Where did my petrol go? - Page 3

T-Cut · 14th March 2012, 12:37

I doubt the difference in fuel level between day and night is significant. The fuel gauge is not an 'intelligent' system, it's a simple analogue gauge responding to a voltage variation from the level sender rheostats. The tank is divided by a central ridge and fuel is drawn from the drivers side by the pump module. The high pressure fuel (petrol) flow is divided and operates two venturi (static) pumps within the tank, which distribute the contents to ensure the supply to the pump inlet is maintained at all times. The diesel system is slightly different, but the nett effect is the same. To ensure there's always fuel at the pump inlet. There is a float level sender in both sides of the tank - one on the pump module and one on the filter unit. The gauge integrates their signals to display the net contents. Erratic gauge output may be due to erratic floats. If one or both has been disturbed when the pump and/or filter module has been serviced, it is difficult to get the floats repositioned right. This may cause binding in certain positions. The floats operate a rheostat with a linear resistance value against float level. You can check the float resistances using an ohm meter. There's a connector socket under the rear seat, driver's side. This diagram may help.

TC

crofts · 15th March 2012, 03:09

Oh I see. As accurate as the temp. gauge then !

14th March 2012, 12:37	#21
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,753 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	I doubt the difference in fuel level between day and night is significant. The fuel gauge is not an 'intelligent' system, it's a simple analogue gauge responding to a voltage variation from the level sender rheostats. The tank is divided by a central ridge and fuel is drawn from the drivers side by the pump module. The high pressure fuel (petrol) flow is divided and operates two venturi (static) pumps within the tank, which distribute the contents to ensure the supply to the pump inlet is maintained at all times. The diesel system is slightly different, but the nett effect is the same. To ensure there's always fuel at the pump inlet. There is a float level sender in both sides of the tank - one on the pump module and one on the filter unit. The gauge integrates their signals to display the net contents. Erratic gauge output may be due to erratic floats. If one or both has been disturbed when the pump and/or filter module has been serviced, it is difficult to get the floats repositioned right. This may cause binding in certain positions. The floats operate a rheostat with a linear resistance value against float level. You can check the float resistances using an ohm meter. There's a connector socket under the rear seat, driver's side. This diagram may help. TC Last edited by T-Cut; 14th March 2012 at 12:41..

15th March 2012, 03:09	#22
crofts I really should get out more....... 2003 Rover 75 Conn. SE Auto Tourer 131 ps CDTi Join Date: Nov 2006 Location: Bristol Posts: 2,512 Thanks: 38 Thanked 67 Times in 55 Posts	Fuel Gauge Oh I see. As accurate as the temp. gauge then ! __________________ Rover 75 CDTi SE Connoisseur Tourer (2003) In desirable STARLIGHT SILVER (now restored to it's former glory with all the chrome !)