Boosted NNBS (non flex) fuel pump replacement
07-23-2013, 11:05 AM
#1
Boosted NNBS (non flex) fuel pump replacement
I fear I’m experiencing a fuel pressure loss while in boost. Bank1 is going lean somewhere above 3psi confirmed by both wideband and O2’s. Hoping to test fuel pump tonight once I make it by sloworeillys to borrow a gauge.
Truck is an 08 5.3 TVS’d running around 6psi (impatiently waiting to swap the 3.6 for a 3.2 pulley). Truck appears to have the FSCM / FPCM by the spare tire. I’ve read that the FPCM complicates or eliminates the option of a boost a pump.
What is the best inexpensive way to upgrade the fuel pump? I’m not prepared to drop the $350+ for a new flex assembly as I just completed a 80e swap. Also I’d rather not chop up the bucket if I can keep from it. I’ve seen several installs of the 255LPH Walbro and mention of same or larger Aeromotive but not a lot when it comes to the returnless FPCM setups.
Set me up only want to drop a pump in once!
Truck is an 08 5.3 TVS’d running around 6psi (impatiently waiting to swap the 3.6 for a 3.2 pulley). Truck appears to have the FSCM / FPCM by the spare tire. I’ve read that the FPCM complicates or eliminates the option of a boost a pump.
What is the best inexpensive way to upgrade the fuel pump? I’m not prepared to drop the $350+ for a new flex assembly as I just completed a 80e swap. Also I’d rather not chop up the bucket if I can keep from it. I’ve seen several installs of the 255LPH Walbro and mention of same or larger Aeromotive but not a lot when it comes to the returnless FPCM setups.
Set me up only want to drop a pump in once!
07-23-2013, 08:19 PM
#3
If the pump is as Walbro says compatible with variable input voltage and I stay returnless what issues would I have if its too large and how would I know? How about voltage requirements and the stock wires and the FSCM?
07-23-2013, 09:18 PM
#4
Not finding much info on the 450.
How about the AEM fuel pumps part number 50-1000 and E85 50-1200 shows voltage as low as 6vdc and around 320lph at 43psi but didn't see any reference to pulse modulation or returnless.
The Aeromotive stealth FAQ indicates they are not recommended for returnless systems but do support pulse width.
What are you guys running on your FPCM returnless systems?
How about the AEM fuel pumps part number 50-1000 and E85 50-1200 shows voltage as low as 6vdc and around 320lph at 43psi but didn't see any reference to pulse modulation or returnless.
The Aeromotive stealth FAQ indicates they are not recommended for returnless systems but do support pulse width.
What are you guys running on your FPCM returnless systems?
07-25-2013, 05:40 PM
#5
Pump tested out around 60 while cold once warm dropped to just less than 50. Didn't see the pressure drop while in boost but also didn't see it rise while the RPM's and load increased.
Any thoughts to why it would start going lean out of the blue?
Any thoughts to why it would start going lean out of the blue?
04-16-2016, 07:22 PM
#6
Not finding much info on the 450.
How about the AEM fuel pumps part number 50-1000 and E85 50-1200 shows voltage as low as 6vdc and around 320lph at 43psi but didn't see any reference to pulse modulation or returnless.
The Aeromotive stealth FAQ indicates they are not recommended for returnless systems but do support pulse width.
What are you guys running on your FPCM returnless systems?
How about the AEM fuel pumps part number 50-1000 and E85 50-1200 shows voltage as low as 6vdc and around 320lph at 43psi but didn't see any reference to pulse modulation or returnless.
The Aeromotive stealth FAQ indicates they are not recommended for returnless systems but do support pulse width.
What are you guys running on your FPCM returnless systems?
Intrested in this also
