Pump suggestions for boosted 03 LQ4?
#1
Pump suggestions for boosted 03 LQ4?
2003 Sierra 2500HD 6.0L
Magnuson TVS1900 w/ 9lb pulley & 42lb injectors
Stock Delphi in-tank fuel pump
Also has the in-line pump that Magnuson supplies for 03 models only...
I'm not getting enough fuel and leaning out too much around 4500rpm.
What would you do? Upgrade in-tank with Walbro GSS340 and hotwire kit and leave the in-line there? Or upgrade the in-tank and remove the in-line? I do have a GSS340 (pump only) that came with my kit for 04-06 models but it doesn't look the same as my stock 03 in-tank pump setup....there's 2 hoses in the stock pump, only one in the 340...
If I remove the inline and install the Racetronix suggested parts list below, will that be enough?
Pump Drop In - Racetronix - FPM-007 - Fuel Module, GM SUV, High Perf. Type 007
Hotwire Kit - Racetronix - FPWH-001 - Fuel Pump Wiring Harness, 98-03 SUV
Any input will be appreciated!
Magnuson TVS1900 w/ 9lb pulley & 42lb injectors
Stock Delphi in-tank fuel pump
Also has the in-line pump that Magnuson supplies for 03 models only...
I'm not getting enough fuel and leaning out too much around 4500rpm.
What would you do? Upgrade in-tank with Walbro GSS340 and hotwire kit and leave the in-line there? Or upgrade the in-tank and remove the in-line? I do have a GSS340 (pump only) that came with my kit for 04-06 models but it doesn't look the same as my stock 03 in-tank pump setup....there's 2 hoses in the stock pump, only one in the 340...
If I remove the inline and install the Racetronix suggested parts list below, will that be enough?
Pump Drop In - Racetronix - FPM-007 - Fuel Module, GM SUV, High Perf. Type 007
Hotwire Kit - Racetronix - FPWH-001 - Fuel Pump Wiring Harness, 98-03 SUV
Any input will be appreciated!
#3
With the 255 in tank module you have in your link, you will not need a hotwire kit. at least I have not with mine. BUT, i think that you will need more than a 255lph pump. I believe a 400/450 will be needed. I currently have that same exact drop in pump in your link in my 03 and I plan on upgrading to a 450 in preparation for for boost. I will also be installing a hotwire kit when i bump up the pump to a 450
_Zblee
_Zblee
#4
I had the same setup on my 2500hd a few months ago. I swapped out the inline since it's a 190 for a 255 and changed the injectors to 60s. (That was with a 2.8 pulley) Now that I have a cam and 2.7 pulley i removed all of it and did an intank 450, racetronix harness and external fuel regulator.
#5
I had the same setup on my 2500hd a few months ago. I swapped out the inline since it's a 190 for a 255 and changed the injectors to 60s. (That was with a 2.8 pulley) Now that I have a cam and 2.7 pulley i removed all of it and did an intank 450, racetronix harness and external fuel regulator.
Racetronix said they can set me up with that same unit I linked to but with a 340lph upgrade. I think that's the route I'm gonna go, then take out the magnuson supplied in-line, and upgrade to 60# if the injectors are then the limiting factor
#6
The injectors my brother got with a camaro he bought to return to stock, so they were free...lol. With doing the cam I wanted to prepare with all the fueling needs. Not sure if I really needed them but 60s I was told more than once to go with.
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06-03-2016 04:26 PM