02 S60 right fuel tank left fuel tank

[sergio]

.

Dice Vida reading of fuel tank(s) ;
left tank; 3 gallons
right tank; 4 gallons

So I have 7 gallons left in there to drive with. Right?
Or, does it mean I have 4 gallons total (of which 3 is in left)

I'm asking this stupid question, because I see only one physical tank in the car.
Reference to two tanks is confusing. Is there a deeper pocket in the tank? Part of the tank is used as reservoir. Or, is it a virtual tank?
I will know it for sure when I fill it to rim, but right know I'm on empty stomach.


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[jimmy57]

The tank has a raised center to clear exhaust and rear driveshaft on AWD models. The pump is on the RH side and the fuel goes from there to engine. The left side gets fuel sent to it and a venturi device (called an ejector pump but there are no moving parts) gets fuel spray across an opening and it picks up an fuel and dumps it into the fuel pump cup on RH side. Once fuel falls below about 1/2 gauge the fuel level on LH side will start falling and the RH side will stay the same untio enough fuel is consumed that there is no fuel to be picked up on LH side. If you were to go drive your car 50 miles and recheck the LH and RH fuel levels you'd see RH with 4 gallons and LH with 1 gallon or less. AT the point the LH side has no more fuel to pick then the RH side begins to drop below 4 gallons. Up to that point the fuel dumped on RH side spills over the hump.

[sergio]

Thanks for the clear and detailed answer.
Cars were much less complicated when I sat behind the wheel the first time.
No starter, no passenger wiper, no direction lights, no antifreeze and just one simple flat bottomed fuel tank. Now they even break when a pedestrian crosses the street.

[regent]

In an even earlier version (self-propelled ) of the vehicle you are referring to, there were no dustshields or subframes either. Propulsion could easily become a collective effort, though braking was a bit of a challenge, but overall, pedestrians weren’t much of a concern...

[Vatnehol]

All p2 chassi gasoline tanks are not completely seperated inside, what jimmy states above is not all true, but mostly.
The tank is connected at forward and downward end, where the pump that is located at right hand side have a suction hose with a suction filter at the end is position down in this " tunnel " that connects both side of the tank. also all the wiring to the pump and level sensor on pump goes through this " tunnel " and goes out of the tank on left side at the position unit.
the level is the same on both sides. suction hose is at the lowest position.

[jimmy57]

I was only referring to his AWD model and any others with tanks with raised center section.
The hose you refer to as suction hose is actually a pressure hose to the point where it enters the ejector pump. The fuel sprayed out of the orifice across the opening into the larger hose going back to RH side works by venturi action to create the suction at that point. The source of the fuel sent to LH side to allow the ejector pump to do its function is from returned fuel from fuel pressure regulator. On later models sold in North America and some other markets there is no FPR since the main pump is speed controlled for pressure and has no pressure regulator. These models with tanks that have the interrupted sumps use a second pump on the RH side to send fuel over to the LH sump for the ejector pump. None of the tanks are completely separated inside, only the lower portion is separated. In North America a small percentage of P2 fuel tanks in S60 and V70 FWD cars had the flat bottom tank with no LH to RH fuel transfer system and no LH fuel level sensor.

[goldxc70]

Sorry to bring up an old thread but ... my problem is that my 2004 XC70 starts acting like it has run out of fuel when it reaches between 1/4 and 1/8 level. It will cut out but immediately restart. Eventually, it shows 1/8 full but won't start. No codes are generated. If I add some fuel, everything works as it should. This car has no fuel pressure regulator. Any ideas on what the specific problem is?

[bugeye]

Suspect the level transmitter sticking showing fuel in the tank, but no fuel available to pump to engine. Suggest never allowing fuel level to drop this low as the fuel cools the fuel pump motor.

[goldxc70]

Suspect the level transmitter sticking showing fuel in the tank, but no fuel available to pump to engine. Suggest never allowing fuel level to drop this low as the fuel cools the fuel pump motor.

I can tell by the amount of fuel I add afterwards that there is always about 1/8 of a tank left when the cutting out occurs. I suspect it has something to do with the transfer from the left side to the right side (where the pump is).

[jonesg]

Only way to really know is pull the plate and take a peek. Could be clogged pump filter.? WHo knows.