2005 Escalade ESV LS3 swap Fuel pump

[Knightflyte]

Hey Guys!

Looking at swapping in a LS3 and I need a new fuel pump that pushes the same pressure but increased volume. Racetronix has a drop in module for trucks, TU464HP-2 which is

• Genuine TI/Walbro: Equipped with a genuine high-performance turbine pump for OEM-level reliability.
• 400 LPH Effective Flow: Real-world flow rating calibrated for 58 PSI operating pressure (not a theoretical max).
• E85 Optimized: Fully compatible with Ethanol, E85, and all gasoline blends.
• Factory Functionality: Retains the internal regulator and Venturi jet-pump system for consistent fuel pick-up.
• Drop-In Fit: Direct-fit replacement for standard GM SUV modules—no tank modifications required.

but its too tall for an ESV/Suburban/Yukon XL 31 gallon gas tank. The factory fuel pump assembly is 19370396, or Delphi FG0809.

Does anyone have a source for these fuel pumps, as a complete drop in option, for LS3 swaps, or is it a Frankenstein fuel pump cobbled together?

Thanks

Curt

 

[Fless]

@Matthew Jeschke didn't you deal with something like this? I can't recall if you came to any conclusion.

 

[Matthew Jeschke]

@Fless I did thanks for pinging me...

@Knightflyte walbro makes a drop in sending unit assembly with that same pump. I see it off and on but don't see it right now in the summit catalog? Otherwise likely a frankinstien. All my friends builds went the later route (cobbled together).

I'm probably sharing way more than necessary, you're setup likely won't experience issues I had. Mainly sharing out of the pain an anguish I had tracking down issues.

You may like to play with this calculator if you haven't already. I think your factory pump is a 140 LPH pump with a return-less style fuel system: https://deatschwerks.com/pages/fuel-pump-calculator

Backstory:

I swapped in a 340 LPH pump into my factory sending unit. I have a return style fuel rail. The return line meant the pump flowed at it's rated flowrate always. This literally sucked the factory sending unit (basket) dry and pumped air into the rail anytime I was under 1/2 a tank.

My return style setup would require a surge tank / different basket design to work properly. I think since you're return-less you'll not have quite as much a concern. My friend who recommended the pump I bought has done a few 340LPH pumps (linked below), all of them on return-less rails though. He's not had an issue. They put them in the factory sending unit and only swapped to a larger relay and fuse in the junction block. Note if you're engine pulls enough flow you can melt the junction block, possibly the harness too doing this. They've not had an issue with that though.

WIRING: You'll 100% need to upgrade the relay and fuse for your pump. I made a breakout, so the main fuel pump fuse triggered a LARGER fuse outside the junction block. Then I fused the relay for the pump at 15 AMPS. The factory pump pulls ~2A w/ no restrictions (flowing through open hose). I have to look at my notes when I tested to say precisely... The higher flow pump will pull several times that much current. I also ran a 12 gauge wire back to the sending unit for power and then to the ground. Actually fairly simple to do. MAKE SURE you don't do any janky wiring. The neighbor kid's truck club somebody did the pump upgrade and burned their truck to the ground. They inadvertently created a hot spot in the pump connector. I ran 12 gauge ALL the way to the connector and re-pinned chassis side of the connector as well, no splices.

I have a bunch of parts at my house if you need anything...

This is the pump I have experience with.

AEM Electronics 50-1200 AEM Electronics High-Flow In-Tank Electric Fuel Pumps | Summit Racing

Free Shipping - AEM Electronics High-Flow In-Tank Electric Fuel Pumps with qualifying orders of $109. Shop Fuel Pumps at Summit Racing.

www.summitracing.com

Radium Engineering 20-0375

Free Shipping - Radium Engineering 20-0375 with qualifying orders of $109. Shop Automotive Fuel Lines at Summit Racing.

www.summitracing.com

Another friend runs the simple Bosch pump...

OEM 0580254044 GENUINE Bosch 044 Universal Inline External Fuel Pump 300lph E85 | eBay

Manufacturer Part Number: 0580254044. 1PCS 044 Racing External Fuel Pump. Can be installed along with a high performance walbro intank fuel pump or alone. Fuel Type: Gasoline. Hope you enjoy buying from us!

www.ebay.com

WARNING: DO NOT USE THESE SCREW STYLE FUEL LINE HOSE CLAMPS!
They come off. Harbor freight sells a box of crush style ones that DON'T work loose.

Summit Racing SUM-390561 Summit Racing™ Fuel Injection Hose Clamps | Summit Racing

Free Shipping - Summit Racing™ Fuel Injection Hose Clamps with qualifying orders of $109. Shop Hose Clamps at Summit Racing.

www.summitracing.com

 

[lt1z350]

So I have a 2007 that’s originally a 5.3 flex truck. The flex trucks have a 255 pump stock give or take as I pulled that factory pump out of it eventually and put a 450 in the stock bucket. I have a lsa blower on the truck a the stock 5.3 headers dual 3 inch big 4 inch intake and 14 psi on 93 I was maxing out the lsa injectors. The fuel pump was still hanging in there though showing how damn good a factory flex pump is and how much hp it can support. It wasn’t until I did 1000cc injectors and went on e70 that it really suffered on the low side. So I added a msd bap at that point and ran that until I did the 6.2 ls3 heads combo that now makes over 650whp so I at this point put a 450 Walbro in my stock bucket. I also added a lsa zl1 regulator into the bucket and I DO NOT have a return line on this vehicle. It doesn’t run away on idle pressure and I’m seeing 80 psi at wot. So there are many myths I read about doing mods like this and you must do this and must do that. Like when I did my 6l80e swap I did things that many said you can’t do and it is just fine. Been on this msd bap for 7 years now and it’s not failed as many say they don’t last. Truck had 110k on the 5.3 blower setup that was fast enough to go 11.7@114 mph at one point so do the math and will see it was making a lot of power on the old 5.3 stuff with a stock fell pump and a bap on it.
So a ls3 swap that is making less hp then my setup was making will be just fine on a stock flex pump for that year. I ran the Delphi up until it failed that is when I took my stock pump that had 80k on it and did the 450 swap knowing it was soon getting this 6.0 that’s .060 over engine build o did for it so did the pump that the new anyway going to need in it. Don’t over think you combo a flex pump will hold your hp just fine. For example a stock c6 z06 uses the same pump as the flex fuel trucks do I had both laying on my bench and they were identical. Which the z06 has been flowed at 255 lph. That was the OEM pump not some cheap aftermarket though. I will say this Delphi that I took out of it the pump was a little smaller to the OEM one. So brand does matter. Though I did run the Delphi a long time on the bap with no pressure issues. I hope this helps and can message me if have anything specific to ask. I do all my own tuning I actually tune gm for a living and hold a bunch of the gm gen 5 records on the zl1 camaro. My ls tuning is just as strong as my lt and am always around to help anyone on a combo question as I do tons of these at my shop in Tennessee