Wondering what the difference is between the 3.8 SC fuel pump and the 3.8 non SC and N* fuel pumps? A Bonneville SLE and GXP use the exact fuel pump, yet the SSEI is a different fuel pump.

The reason I am asking is I installed a DELPHI fuel pump in my 2001 SSEI a few months back, and would like to move it to my 2005 SLE and was surprised to find the part is different.

I believe the ssei pumps flow at a higher rate, as the supercharged motors require more fuel than the N/A motors do. The L67 has larger injectors, 36lb/hr vs I believe 22lb/hr in the L36, so the L67 requires the larger fuel pump to feed the injectors. I'm not sure if the larger pump would cause any problems on the L36 or Northstar, or if the fuel pressure regulator would keep things in check.

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Joseph

Current: 2013 Infiniti G37 Journey
1999 Infiniti G20T - Sold
1999 Buick Lesabre - Race Couch - gone but not forgotten

As Jfridge92 said, the SSEi pump operates at higher pressure and volume. It also operates at a slightly lower voltage.
Don't think your GXP would be able to run right.

You can read the specs for the 2 on Delphi's online catalog pages, on the buyer's guide tab.
http://partcat.com/delphi

If you look them up on rock auto they lise the same pump for the SLE SSEi as well as the LeSabre

No.
The SE and SSE and LeSabre share the same pump as the GXP but the SSEI does not.
If you saw a listing on Rockauto where it states otherwise, tell us what specific year Bonneville you looked up and saw that

As far as pressures go,

L67 Pumps should run 53 - 59psi
LD8 Pumps should run 41 - 47psi

However, in all my GM parts lookups I have, I am coming up with part# 19180117 for all... For SSEi, SLE, and GXP

So you may have to go to the dealer to make sure that you get the right one. I've found what I can access through the intertubez isn't always right and that the official SPO has more detailed options. So what is on RockAuto probably isn't right. I've run into the HO2S's a lot.

_________________


Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2019 Chrysler Pacifica Limited: Mommy's new RGC
2015 Chrysler Town & Country Limited Platinum: Kids new RGC
2007 Chrysler Town & Country Limited: Sold to neighbor
2009 Pontiac G8 GT: L76, Sport Red Metallic
2003 Chevrolet Suburban 2500: Doeskin Tan - 8.1L Big Block... new plow truck
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck

FWIW, the online ACDelco catalog cross-indexes GM 19180117 to Part Number: MU1793 and lists MU1791 as the naturally aspirated engines' fuel pump.
Isn't ACDelco the parts division of GM ?

Not sure how the actual business arrangment is, but AC Delco makes/supplies parts to GM. GM will take their part and assign their own number in the SPO. Every part has it's own unique number. Even if you have 4 identical bolts, each will have a part number. At least that is the way it was a couple years ago. They may have streamlined things a little since.

At the same time, AC Delco also sells the same part, under their own brand, and as such they can have their own part number out on the free market also.

_________________


Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2019 Chrysler Pacifica Limited: Mommy's new RGC
2015 Chrysler Town & Country Limited Platinum: Kids new RGC
2007 Chrysler Town & Country Limited: Sold to neighbor
2009 Pontiac G8 GT: L76, Sport Red Metallic
2003 Chevrolet Suburban 2500: Doeskin Tan - 8.1L Big Block... new plow truck
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck

Thanks for the detailed explanation.
I had wondered why there were sometimes GM parts numbers and ACDelco parts numbers for the same parts.

Good stuff.

My question is what is the risk if any of running a higher than called for psi fuel pump (putting a L67 in a vehicle that requires a LD8)? Is it like running 93 octane in a vehicle that can run 87 octane, or is it something that is going to cause fuel distribution issues?

Not on these cars that have fuel pressure regulators. You'll just be sending more fuel back to the tank through the return system.

_________________
Bye Bye:

RIP sandrock

Here is how I looked them up. I just looked at the first one which was the Ultra Power and that one is listed as the same for all 3 cars but when you switch to the Delco it lists a different number for the SSEi. so technically they are different, but maybe the ultra just uses the higher pressure pump and the regulator makes it work for the others.


2000 BUICK LESABRE 3.8L V6
Fuel/Air : Fuel Pump
ACDELCO MU1791 $167.89 $167.89

ULTRA-POWER E3518M Module Assembly $67.79 $67.79

2000 PONTIAC BONNEVILLE 3.8L V6 Supercharged
Fuel/Air : Fuel Pump
ACDELCO MU1726 $237.79 $237.79

ULTRA-POWER E3518M Module Assembly $67.79 $67.79


2000 PONTIAC BONNEVILLE 3.8L V6
Fuel/Air : Fuel Pump
ACDELCO MU1791 $167.89 $167.89


ULTRA-POWER E3518M $67.79 $67.79
Subtotal