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V35 Fuel system


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Hallo guys. I have a Nissan Skyline V35 250GT. I hav seen the car has a fuel tank split into two, possibly the main tank and the reserve tank. In the main tank is the pump. My problem is fuel is getting finished in the main tank whilst there will be fuel in the reserve tank.Are they not supposed to decrease in level at the same time? How is fuel added to the main tank from the reserve? I see there is a fuel pipe from the bottom of the reserve tank to the pump filter.How does it work and what could be the problem.

20210906_164714.thumb.jpg.8cc5410453c2c9d991a1630c9268b556.jpg 20210905_174539.thumb.jpg.252b0fb8be4badb4d5c80057a114c4d9.jpg

 

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it is one big tank, not a main and reserve, but due to the shape of the vehicle it is high in the centre, there is what is called a 'jet pump', which is responsible for moving fuel from the side without the pump to the side with the pump.

see this page for a description.

https://www.sard.co.jp/after_eng/products/engine/jp_killer/jp_killer.html

This isn't quite the same as the V35, I believe the 250GT is the same as the 350GT and has the pressure regulator built into the fuel pump assy, not external like the image in the link.

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Yuh, they are referred to as a "saddle tank" because they go up and over the horse in the middle. As @sonicii above says, there is usually a venturi type pump that runs from the return flow or similar to draw fuel from the dead side to the live side (live side being where the main pump draws from).

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  • 2 weeks later...

Sorry for the late response guys but would like to thank you for your responses.V35_Paul --- Yes I am running out of fuel yet there will be fuel on the other side of the tank. The 250GT has a single line from the pump to the engine and another line from the other side tank (dead side)onto the pressure regulator as shown in pics below. Any idea as to why we have 2 level sensors one on the dead side and the other on the live side attached to the pump.

20210906_164701.thumb.jpg.6ccff885b317e894cebf7335338efd9c.jpg  20210905_174936.thumb.jpg.d0714c2b33c34d446c64c95ace333217.jpg

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That orange component you can see in your pictures is the jet pump, it is responsible for transferring fuel from the 'dead' side of the tank if the fuel level in that side is higher.  If this isn't happening then I would be looking for issues with the hose or the jet pump.

Keep in mind the 'jet pump' isn't an active pump, it is venturi device that depends on the fuel leaving the pressure regulator and returning to the tank to draw fuel from the other side, so there could possibly be issues with the pressure regulator or the venturi device.

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Thanks @ sonicii for your clear explanation. Atleast I now have an idea of how the system operates. I will do my checks and give feedback. Thanks a lot.

 

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Also just make sure the Fuel sensor is clean.

VERY common that they give a false reading to your fuel gage. E.g if you Fill "to the top" car up and it shows just under the "Full" line then its wrong.

Just use a cotton tip to rub the metal contact points on the sensor attached to the pump

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^^ yep, that is true too.  Except mine of course, it likes to randomly read high, cleaned sensors and connectors, checked for damage/debris on the level sensor, still happens through.  Almost as if one sensor occasionally decides to read 'full' when it isn't.

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  • 4 weeks later...

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