Fuel pump upgrade
Thread Starter
Pro Mechanic
Joined: Mar 2007
Posts: 397
Likes: 4
From: San Antonio, Texas
Fuel pump upgrade
I've been doing some research as I need to build a fuel system for my LSA and want as many factory parts as I can get on it. After measuring I'v found that the C7 ZR1 fuel pump will fit into a late C5 and C6 tanks. I haven't gotten far enough to see what else I will need, but for sure then in tank fuel line will be needed. I'm not sure what else yet, but worse case is the line inside the cross over, and the passenger tank line. Here is the flow numbers for the fuel pump. It looks like it will support 800 fwhp on a supercharged engine with a little room. This is also around a $230 pump.
Looks like the LT4/5 fuel pump will support 800 fwhp on my LSA. Here are the flow numbers I got back on it compared to the CTS-V pumps.
At 60psi = 1.37gal/min, 82.2gal/hr.
At 6lbs/gal, = 82.2 * 6 = 493.2 lbs/hr
Most modern supercharged engines up to 750hp need 0.6 lbs per hour per horsepower (Brake Specific Fuel Consumption/BSFC) 493.2/0.6 = 822hp.
CTS-VLH, CTS-VRH, 2019 Z06/ZR1 (liters per minute.)
40psi 6.28 6.35 6.30
45psi 5.95 5.96 6.02
50psi 5.61 5.66 5.75
55psi 5.39 5.38 5.54
60psi 5.02 5.03 5.18
65psi 4.22 4.35 4.92
70psi.............. 4.65
75psi.............. 4.35
80psi ..............3.13
86psi ..............0
Looks like the LT4/5 fuel pump will support 800 fwhp on my LSA. Here are the flow numbers I got back on it compared to the CTS-V pumps.
At 60psi = 1.37gal/min, 82.2gal/hr.
At 6lbs/gal, = 82.2 * 6 = 493.2 lbs/hr
Most modern supercharged engines up to 750hp need 0.6 lbs per hour per horsepower (Brake Specific Fuel Consumption/BSFC) 493.2/0.6 = 822hp.
CTS-VLH, CTS-VRH, 2019 Z06/ZR1 (liters per minute.)
40psi 6.28 6.35 6.30
45psi 5.95 5.96 6.02
50psi 5.61 5.66 5.75
55psi 5.39 5.38 5.54
60psi 5.02 5.03 5.18
65psi 4.22 4.35 4.92
70psi.............. 4.65
75psi.............. 4.35
80psi ..............3.13
86psi ..............0
Race Director
Joined: May 2004
Posts: 16,667
Likes: 1,209
From: Raleigh, NC
St. Jude Donor '15
I’m pretty sure all of those need a fuel pump control module as well In order to function. No idea how you’re going to get that to work trying to either use a fpcm from a c7 or ctsv on a c6. There are certainly easier options.
Last edited by schpenxel; Oct 19, 2019 at 11:20 PM.
Safety Car
Joined: May 2006
Posts: 3,696
Likes: 490
From: Potomac MD
Might be easier to just take a C6 pump and put the Walbro 340 lph in it or get one already done by Lingenfelter which I think use a 450 pump. The 340 I think is measured at 42 psi so that would be 5.7 liters per minute at 42 psi. I think they also recommend a new wire harness once you get up to the 450 to factor in the current draw. As a reference the stock C6 Z06 pump does 4.5 liters per hour at 50 psi and like 4.8 liters per hour at 40 psi.
Thread Starter
Pro Mechanic
Joined: Mar 2007
Posts: 397
Likes: 4
From: San Antonio, Texas
vapor worx makes a controller for it which can be either a fixed pressure for a NA engine or a boost referenced increasing pressure for turbo/supercharger engines.
