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Hoping to get some help from you guys. Just got my built 370. Getting ready to start this build. Its on 02 camaro LQ4. Going to run roughly 15# of boost. Need suggestions on the fuel system. I bought hi flow fuel rails and have twin 255s, but not sure if thats the route i'm going. Looking to do a return fuel system as well. So I'll be running 8an feed line off the sending unit that I have already, into the fuel rails, to a boost referenced FPR, then return to the tank. Where do I run the return to? There seems to be a bit of conflicting info out there for these plastic tanks. Also what pump setup to support roughly 700 wheel HP and possibly more down the road? Good source to purchase fuel system parts from? Any help and direction here would be greatly appreciated fellas. Thank you all ahead of time!
Dual 450s are overkill on pump 93 with a 700-800 goal. Just run a single walbro 450 or the new DW 400 pump and call it good.
Doesnt seem like its leaving room to grow though. Motor is built to go well over 1k hp so hard to tell where I may settle. Just making sure I do it right the first time.
i would run the 80s and a walbro 450 with meth.you can always add another 450 later but I don’t think you will need it. Just run -8 to the rails, -6 return. Put the regulator after the rails. I would run a racetronix Hotwire kit for the fuel pump also. I run a single 450 with meth @14lbs and have plenty of fuel even with 65lb injectors.
If you're ever gonna put it on corn and aim for > 700 wheel, plop the second 450 in there while you have it apart. Would have saved me a lot of hassles
If you're ever gonna put it on corn and aim for > 700 wheel, plop the second 450 in there while you have it apart. Would have saved me a lot of hassles
What does it take to get 2 450s in there if you dont mind me asking?
What does it take to get 2 450s in there if you dont mind me asking?
I don't have an fbody, but I wye'd a -8 from each pump after the tank to a -10. Two sets of bulkhead electrical passthroughs made from nylon bolts and nuts. Second pump on a Hobbs switch to a China SSR.
I would think the twin 255's you have now would support your goals on pump gas. Another option which isn't as common is an external pump. Not an Fbody, but here is my fuel system using the stock feed as a return. I'll be running E85 and 95 lb/hr injectors. I put this together myself with the focus being simplicity and effectiveness.
Awesome pics and thanks guys. So 2 450s do fit it looks like. Crazy, didnt think there would be that much room. And yeah thats what I'm trying to decide if I should just sell off that sending unit set up with twin 255s or just remove them and fit them to my set up.
Dual 450s are overkill on pump 93 with a 700-800 goal. Just run a single walbro 450 or the new DW 400 pump and call it good.
If this statement in quotes below is accurate then agree.
"OK stay with me now as we calculate how much gasoline fuel we need to support say 1000 HP. 1000 divided by 12 = 83.3 Gallons Per Hour or 315 Liters Per Hour. "
Complete thread with an explanation for the statement above is in this link below.
Post # 6 and #15 in link below supports the fact the bigger isn't always better or required
So two 450's would pump 900 lph. That's almost three times the amount required. Actually two 255's is more than enough. Next step up from two 255's with duals could be the Racetronix RXP341 (or other 340's) which pumps 340lph. That's 680 lph - again - that's twice what is required.
IMO one important item sometimes is forgotten or not mentioned is the amps required to maintain maximum voltage (13.5 or more) to each pump. Some larger pumps draw way more than 14 amps. Not funny - but you see pics of the stock fbody bulkhead running the power to dual pumps thru the tiny yellow bulkhead connector that only supports 14 amps. The upgraded 99-2002 bulkhead connector supports up to thirty amps.
The only real question here is if E85 is a possibility for the future. If so, definitely go with two 400s/450s. If not, as mentioned above, anything more than one 400 or 450 is overkill.
07-23-2018, 10:16 PM
Fuel system questions for turbo build 
