Q8 6.0

I have 2005 sierra I have in the tank fuel pump from magnacharger I have noticed after 408 install my pickup is always around 51 psi at idle and at full throttle it is around 45 psi. Anyone have tips.how to increase the fuel pressure all round

Thanks

Q8 6.0

https://www.performancetrucks.net/fo...1&d=1360785811

nonnieselman

iTrader: (10)

You might try to get a Adjustable Regulator? Do away with the factory and just use it with a vacuum/boost reference maybe?

Q8 6.0

That sounds very complicated but thanks for a idea I was looking to try simple solution first to check maybe lines or electric... Dose anyone think the fuel pump which came with the radix kit is enough for the 60lb injectors 10psi boost and 408

Thanks

Gadgetized

iTrader: (9)

If you are running 10 PSI on a 408 with a Radix, you are really turning it! You could try a boost a pump or a Magnavolt to increase the fuel flow. The real problem is that the regulator is in the tank. The regulator sets the fuel pump inside the tank, and the engine runs off of the fuel pressure at the rail. In a perfect world it would be the same, but the lines and distance cause a restriction lowering the pressure at the rail.

Q8 6.0

I think I understand what your saying. Is that the regulator is commanding for example 55psi but the travel and size of pipes fuel rail pressure will be lower yes makes perfect sense.. So my fuel pump and regulator are working perfectly at idle as I see about 51 psi at rail. But when I go full throttle pump can't keep up around 5000 rpm so looks like boost pump might help..

Went to dyno last night air fuel just gos lean around 5000 rpm

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Q8 6.0

AgFormula02

iTrader: (9)

You need more pump or a boost a pump.

Q8 6.0

Yes bro .. That what im going to do first i going tonight get msd boost a pump i will do a serch on this fantastic forum how to install it will go back to dyno see if it works

But im worried that on dyno with zero g force pull it wont give real world air fuel pressure

TX Tahoe Z71

iTrader: (28)

When installing my BAP on my 2003 Tahoe, it was the thick gray wire under the underhood fuse box. Mounted the BAP with self-tapping screws on the backside of the fuse box facing the firewall. With the stock flex fuel pump, it's keeping up with my 75# injectors.