Fuel Pump Too High Pressure?

[BigWing]

Hey guys,

Just wondering if anyone can help me... I have drive an R33 GTSt that now has a GTS engine. It used to be a track car, so it has a big (loud) Bosch 040 fuel pump, as well as a big ass exhaust. The car has been using 15L/100kms, which is quite disgusting and worse than it used to do with 250+kw.

I'm going to stick a standard exhaust on this weekend to see if that makes a difference, but I'm also wondering if the fuel pump could be too high pressure and over supplying, and therefore wasting a lot of fuel. The guys at UltraTune suggested this might be the case, but I thought that the injectors would stop it from pumping too much fuel.

If anyone has any insights or advice, please let me know!

Thanks guys

[lammy426]

Hey guys,

Just wondering if anyone can help me... I have drive an R33 GTSt that now has a GTS engine. It used to be a track car, so it has a big (loud) Bosch 040 fuel pump, as well as a big ass exhaust. The car has been using 15L/100kms, which is quite disgusting and worse than it used to do with 250+kw.

I'm going to stick a standard exhaust on this weekend to see if that makes a difference, but I'm also wondering if the fuel pump could be too high pressure and over supplying, and therefore wasting a lot of fuel. The guys at UltraTune suggested this might be the case, but I thought that the injectors would stop it from pumping too much fuel.

If anyone has any insights or advice, please let me know!

Thanks guys

think you need a aftermarket fuel press regulater with gauge,press should be 2.5 bar and 3.2 on boost,the injectors only time the injection turning fuel press up increases fuel aswell

[BigWing]

think you need a aftermarket fuel press regulater with gauge,press should be 2.5 bar and 3.2 on boost,the injectors only time the injection turning fuel press up increases fuel aswell

Would it be better to just get a standard fuel pump and sell the Bosch?

[Shano3000]

Its the Fuel pressure regulator that will determine the fuel pressure in the fuel rail. No point changing the pump back to stock.

unless the pump is supplying too much fuel for the regulator to release back to the tank, resulting in higher pressure. Best to get a fuel pressure gauge and have a look first before touching anything.