I'm looking at getting an aftermarket fuel pump or combination fuel/air separator pump (like fass etc) and I'm wondering if anyone here knows the stock fuel pressure and pump gph specs off the top of their head? I can find OEM type pumps but the specs arn't listed...just says compatible with the engine etc.

Also - is there any benefit to slightly upping the fuel pressure on the v12? such as better injector fuel spray/atomization?

 

No benefit in upping the pressure if engine is standard (which requires a change in B bank FPR, nothing to do with the pump). No benefit either in doing anything or buying any other parts than making sure the OEM fuel system is in top condition, IMO. Fuel pressure as standard is about 2.5 bar. there are loads of cheaper oumps on Ebay, and while personally I would not trust them, Orangeblossom has one and it works fine!
Greg

 

I found the stock fuel pump (91 5.3) seems to lose some pressure when hot restarted. I've tried two stock FPR's and now use a gauge mounted on the fuel rail and aftermarket adjustable regulator. Set at 40 lbs cold, falls to around 32 during hot weather restart, returning to 40 after 5 mins . But I also am thinking aftermarket fuel pump. I read some are running 45 psi. with good results, I guess with the stock pump

 

Bosch 0 580 464 008 original with slide connector
Bosch 0 580 464 070 replacement with threaded connector, Flow qty litres per hour is 130 (3bar)

Immerced pump from 92 is walbro Flow qty litres per hour is 130 (3bar)
Walbro OEM Fuel Pump Kit - PN# 5CA246.

 

Since my car sat between 1997 and 2010, my tank is full of crap and I have killed a couple of pumps.

I toasted the first, replaced it with a chinese thing that lasted about 4-5 years and im on my second cheapo chinese pump. This is one of the blue ones that runs about $25.00. They run loud but im cheap and at least you can hear the difference when they start going out.

Here is the spec listed for mine:
Flow rate - 135ltr/hr @ 3bar (35 gal/hr @ 45 psi)

 

quick pix.

NO rust in my system, NASCAR fuel cell, polypropylene plastic 20 USA gallons.

custom Chinese pump(USA made only lasted 18years) SX aero pump and filter, also SX adjustable FPR, aero lines and ali tubing 1/2" ID.

pic of pressure 45 psi no vac.

i have an adjustable lean or rich mixture control knob on consoul, with AFR gage, aircraft style!

 

Pulling my tank and retro-fitting a fuel cell for my car seems like the best option for my car and budget. RonBros, I was wondering if you could be so kind to e-mail me a drawing of your design and specs(pics looks great) so I can wrap my head around this.
Frank.Meier@ucps.k12.nc.us