those running dual fuel pumps...
#21
Originally Posted by Racetronix
The key to your problem there was relocating the regulator to the front of the car NOT the feed line. How can there be compensation for line drop if the point of regulation is in the tank?
#22
10 Second Club
The regulator only bleeds off pressure. There is a straight shot from the pumps to the rails. If the pressure drops it is not from the regulator as it cannot add pressure only reduce it. If there is more pressure than the regulator spec (say 58lbs.) the regulator can maintain that pressure because there is available pressure above the regulated pressure. Once the pressure is below the set regulated pressure the regulator is out of the picture because there is no additional pressure to bleed off. If pressure drops below the regulated pressure there is no fuel being bypassed and all that is available is going to the rails. So the problem is in the lines.
#23
LS1TECH Sponsor
iTrader: (2)
Originally Posted by 2001WS6Vert
The regulator only bleeds off pressure. There is a straight shot from the pumps to the rails. If the pressure drops it is not from the regulator as it cannot add pressure only reduce it. If there is more pressure than the regulator spec (say 58lbs.) the regulator can maintain that pressure because there is available pressure above the regulated pressure. Once the pressure is below the set regulated pressure the regulator is out of the picture because there is no additional pressure to bleed off. If pressure drops below the regulated pressure there is no fuel being bypassed and all that is available is going to the rails. So the problem is in the lines.
In this case the DP system is capable of producing enough volume at the required pressure at the tank end to overcome any frictional losses in the factory feedline in order to maintain stable rail pressure ONLY if the point of regulation is at the rail.
Dropping pressure is due to the lack of regulation at the fuel rail. If the return line was at the rail then pressure would be stable.
In other words the problem is with the position of the regulator in the LS1.
Q. If the pressure is stable at the back of the car under W.O.T. (58PSI) where the regulator is in an F-LS1 but the pressure drops at the fuel rail due to line drop WHERE do you suppose the problem is?
Q. Why don't '97 C5's with front-mounted FPR's experience the same level rail pressure loss as compared to later model C5's or F-LS1 cars with rear-mounted FPR's?
Q. How can the regulator adjust for line pressure drop (by backing up the feed line to the point of pressure relief at 58PSI) if it is located at the back of the car where the line drop is not occurring?
Go plumb a pressure gauge into the back of an F-LS1 car which has rail pressure drop and come back and tell us what you find!
Then relocate the regulator at the front of the car with a return line without upgrading the feedline and you will find that the pressure is stable which indicates adequate volume.
So in conclusion if you want to save a more than a few bucks relocate your regulator to the end of the fuel rail with a return line!!!
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Please support a Racetronix dealer near you for personalized service.
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#26
FormerVendor
I have an LT1, but it made 740 rwhp with dual intanks and stock lines/rails.
Right now it's at 868 rwhp with dual intanks, and has the stock fuel filter and some of the stock feed line. (-6 replaced the plastic under hood fuel line to connect to the aftermarket rails)
Right now it's at 868 rwhp with dual intanks, and has the stock fuel filter and some of the stock feed line. (-6 replaced the plastic under hood fuel line to connect to the aftermarket rails)
#28
10 Second Club
No. I did the fuel rails 1st and then the lines with the Aeromotive regulator. No more fuel problems. The fuel pressure drop that I had after doing the rails did not seem to be enough to effect the power. I just didn't like to see any drop in pressure at all.
#29
TECH Enthusiast
iTrader: (2)
Dual Walbro's. Stock fuel Line, Stock fuel Filter, Stock Regulator. 621RWHP at 10 - 11psi of boost..
It's holding up perfect on my setup. With a single fuel pump, I start to run out of fuel at 5000 rpms. With both on 58psi all the time at WOT.
Here's a link to my Dyno Graph.
http://www.dynopro.com/mhhr_detail.asp?ID=5
Pictures of my Duel Pump Setup are in my Sig..
Regards,
Clint
It's holding up perfect on my setup. With a single fuel pump, I start to run out of fuel at 5000 rpms. With both on 58psi all the time at WOT.
Here's a link to my Dyno Graph.
http://www.dynopro.com/mhhr_detail.asp?ID=5
Pictures of my Duel Pump Setup are in my Sig..
Regards,
Clint
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veryfast89 (11-04-2019)
#31
TECH Fanatic
iTrader: (13)
Originally Posted by HUGGER ORANGE SS
Dual Walbro's. Stock fuel Line, Stock fuel Filter, Stock Regulator. 621RWHP at 10 - 11psi of boost..
It's holding up perfect on my setup. With a single fuel pump, I start to run out of fuel at 5000 rpms. With both on 58psi all the time at WOT.
Here's a link to my Dyno Graph.
http://www.dynopro.com/mhhr_detail.asp?ID=5
Pictures of my Duel Pump Setup are in my Sig..
Regards,
Clint
It's holding up perfect on my setup. With a single fuel pump, I start to run out of fuel at 5000 rpms. With both on 58psi all the time at WOT.
Here's a link to my Dyno Graph.
http://www.dynopro.com/mhhr_detail.asp?ID=5
Pictures of my Duel Pump Setup are in my Sig..
Regards,
Clint
#33
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bringin up a very old post. what are people using for a return line with the dual FP setups?
right now i have a single racetronics and rewire, running billet rails stock fuel line, filter and using the evap line as a return. FPR is mounted on top of that evap line, then in back of car the evap line has been disconnected from the rest of the cannister and dropped into tank via bulkhead fitting.
right now i have a single racetronics and rewire, running billet rails stock fuel line, filter and using the evap line as a return. FPR is mounted on top of that evap line, then in back of car the evap line has been disconnected from the rest of the cannister and dropped into tank via bulkhead fitting.
#36
TECH Addict
iTrader: (2)
and yes lol quite an old post but thought to dig up one then to make a new one.
Ive decided to put the FPR on the stock fuel rail and then plumb a new dedicated fuel return 3/8 hardlline back to the stock plastic fuel return line and block off the t-block.
Last edited by JoshuaGrooms83; 01-12-2013 at 10:56 PM. Reason: found my answer
#37
Teching In
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I will be running dual walbro pumps in my stock fuel bucket. some people say to go with show me speed's kit to save money. I have found out it is the same price as Racetronix dual walbro kit that come assembled with a billet Y vs. plastic. What do you think??? I have a single walbro 341 which I don't think I can use...correct?