Posted By: emarine01
Fuel flow thru reg? - 06/16/13 03:41 PM
How much fuel can you flow thru a Holley 12-803 chrome reg @ 7psi in one min with 18 psi input pressure? Or whats the fastest time anyone has tested in seconds to fill a gallon?
Fuel flow thru reg?
Posted By: Clanton
Re: Fuel flow thru reg? - 06/16/13 04:28 PM
Wont the line to the carbs be the restriction also? 
Posted By: Thumperdart
Re: Fuel flow thru reg? - 06/16/13 04:32 PM
Check out the old Pro-Stock cars and those regs looked like stock Holleys at least from the outside. I`ve seen em on real fast cars recently also..........Try it and post your results.... 
Posted By: skrews
Re: Fuel flow thru reg? - 06/16/13 05:48 PM
Years ago my friend and I tested this. The car had a BG 280 pump, and with the Holley reg it took 40 something sec. With the Holley Big Port reg it took 15ish IIRC. Unreal ! I would never use one of those little Holley regs again. Plenty of people go fast on them, but that don't mean its optimal.
Posted By: MR_P_BODY
Re: Fuel flow thru reg? - 06/16/13 07:57 PM
Quote:
Wont the line to the carbs be the restriction also?
Actually the needle and seat(.110 is stock in most )
is the restriction point)
Posted By: bonefish
Re: Fuel flow thru reg? - 06/16/13 08:42 PM
i gota buddy runs very low 8,s with a holley big port reg,very inexpensive and basic.
Posted By: bigtimeauto
Re: Fuel flow thru reg? - 06/16/13 09:55 PM
Quote:
How much fuel can you flow thru a Holley 12-803 chrome reg @ 7psi in one min with 18 psi input pressure? Or whats the fastest time anyone has tested in seconds to fill a gallon?
Its not about how much one can flow in a minute its about whether or not it can refill YOUR bowls versus how much fuel your car is using. A car with 2 4bbls (4 bowls) obviously holds more fuel than a single carb with only 2 bowls. so its easier to keep filled. You only need to flow enough to keep your bowls filled.The size of your needle and seats also is a factor in restriction.
Fuel pumps need to be strong if they are mounted in the rear to overcome G forces of the car leaving with the gallon or so of fuel in the line.
Posted By: emarine01
Re: Fuel flow thru reg? - 06/16/13 11:09 PM
From the testing we did, BG 280 @ 13.5v thru a Holley 12-803 reg set @ 7 psi it took 28 sec to flow 1 gal, Same set up but with BG reg set @ 7 psi took 19 sec to fill 1 gal, Tested the pump pressure @ 18 psi dead headed, The problem which is new from the last 2 runs is the truck is launching better, 1.39 & 1.35 from 1.65 ave but after the 60ft mark it falls on its face dropping from 6900 to 4500 then hunts up and down to 5500, This was with the Holley reg, We run .120 needles on either a bg 850 annular or a bg 1000 race demon and the annular was the 1.35 60ft, both carbs ran out of fuel @ the 60ft mark, I have swapped out regs to the BG but have no way to test till next week end @ the track , I am not sure if it is a G force problem or a reg volume problem from the difference in faster 60ft times, All opinions welcome, Thankx Craig
Posted By: skrews
Re: Fuel flow thru reg? - 06/17/13 01:23 AM
You running jet extensions in the rear ? And no rear power valve ? You knew somebody was going to ask . 
Posted By: emarine01
Re: Fuel flow thru reg? - 06/17/13 02:11 AM
Quote:Yes & yes, From the best I could tell we were nosing over @ the 175ft mark all season and the rpm would not go much past 7k before this problem started, most likely the small reg, The truck never launched well but made it up mid track, now we are leaving hard and falling flat, The crazy thing is as bad as we are now running we only lost 2 to 3 tenths, it seems that the launch carries the truck all the way thru 200ft.
You running jet extensions in the rear ? And no rear power valve ? You knew somebody was going to ask .
Posted By: bigtimeauto
Re: Fuel flow thru reg? - 06/17/13 02:12 AM
you running a cut open hose from bowl vent to bowl vent? What you are describing is a rich stumble not lean.
Posted By: emarine01
Re: Fuel flow thru reg? - 06/17/13 02:17 AM
No hose on the vent tubes, I will get on it the tubes are kinda short, That never crossed my mind, Thankx
Posted By: bigtimeauto
Re: Fuel flow thru reg? - 06/17/13 02:23 AM
Quote:
No hose on the vent tubes, I will get on it the tubes are kinda short, That never crossed my mind, Thankx
and make sure your floats are set with the car running!
here is a pick of the hose, cut about 1" open:
Posted By: emarine01
Re: Fuel flow thru reg? - 06/17/13 02:30 AM
We set the floats @ idle just past half way up the sight glass, Are you feeding that holley from both sides? If yes why?
Posted By: bigtimeauto
Re: Fuel flow thru reg? - 06/17/13 02:32 AM
No just the one side. Its cleaner to feed it from the drivers side, i hate short stumpy lines:
Posted By: emarine01
Re: Fuel flow thru reg? - 06/17/13 02:42 AM
How steady should a fuel pressure gauge be? I have 7 psi @ idle and if I hold the rpm up high say 6k for 10 secs the pressure will drop to 5.5 and the primary fuel bowl will drop from a bit over half the sight glas to the bottom of the glass?
Posted By: bigtimeauto
Re: Fuel flow thru reg? - 06/17/13 02:46 AM
You should be able to maintain the bowl if the car is not under load.
Posted By: emarine01
Re: Fuel flow thru reg? - 06/17/13 02:54 AM
It doesn't take much pedal to hit 6k no load, Dont know what the level drops to under load, I was supprised to see the level drop no load, is that normal?
Posted By: bigtimeauto
Re: Fuel flow thru reg? - 06/17/13 02:55 AM
no its not, sounds like you need a new pump
Posted By: Thumperdart
Re: Fuel flow thru reg? - 06/17/13 03:01 AM
Mine doesn`t move but maybe a 1/4 lb if that from idle through 7000.........Magnafuel 300 pump and their 2-port reg. Before blameing the reg have you checked for restrictions before the pump? Pre-filter, bends etc.
Before blameing the reg have you checked for restrictions before the pump? Pre-filter, bends etc.
Posted By: emarine01
Re: Fuel flow thru reg? - 06/17/13 03:13 AM
We just ran all new 1/2 inch line from the pump to the reg, fuel tank on top of pump with a straight drop about 10 to 12 inches to the pump feed which is 1/2 also. Removed all filters for the tests, Pump seems a bit louder than normal?
Posted By: bigtimeauto
Re: Fuel flow thru reg? - 06/17/13 03:16 AM
Quote:
no its not, sounds like you need a new pump
this^^^
Posted By: Thumperdart
Re: Fuel flow thru reg? - 06/17/13 03:23 AM
Quote:My pump made some horrible noises right before it locked up and burned down.......Which pump do you run?
We just ran all new 1/2 inch line from the pump to the reg, fuel tank on top of pump with a straight drop about 10 to 12 inches to the pump feed which is 1/2 also. Removed all filters for the tests, Pump seems a bit louder than normal?
Posted By: emarine01
Re: Fuel flow thru reg? - 06/17/13 03:28 AM
Any recommendations on pumps for around 650Hp give or take a few, how big of a pump do I really need?
Posted By: emarine01
Re: Fuel flow thru reg? - 06/17/13 03:30 AM
Quote:BG 280Quote:My pump made some horrible noises right before it locked up and burned down.......Which pump do you run?
We just ran all new 1/2 inch line from the pump to the reg, fuel tank on top of pump with a straight drop about 10 to 12 inches to the pump feed which is 1/2 also. Removed all filters for the tests, Pump seems a bit louder than normal?
Posted By: bigtimeauto
Re: Fuel flow thru reg? - 06/17/13 03:32 AM
Just buy the magnafuel 500, for the money difference its a no brainer. Your probably going to want to go faster at some point anyway.
Posted By: emarine01
Re: Fuel flow thru reg? - 06/17/13 03:49 AM
Thankx for the help
Posted By: Cab_Burge
Re: Fuel flow thru reg? - 06/17/13 04:03 AM
Quote:
Just buy the magnafuel 500, for the money difference its a no brainer. Your probably going to want to go faster at some point anyway.
I've bought way to many smaller pumps before buying the biggest and best 
Same thing on regulators
Posted By: Thumperdart
Re: Fuel flow thru reg? - 06/17/13 04:09 AM
Same here and the 500 is a beast for sure but I went w/the 300 knowing it should handle any n/a junk I throw it`s way and I wil never run a power adder.
Posted By: bigtimeauto
Re: Fuel flow thru reg? - 06/17/13 04:12 AM
Quote:
never say never.........
Posted By: Thumperdart
Re: Fuel flow thru reg? - 06/17/13 05:46 AM
I hear ya but I`m dumb and stubborne and n/a`s a big enuff challenge as it is especially in the suspension dept.
Posted By: Cab_Burge
Re: Fuel flow thru reg? - 06/17/13 08:12 AM
I had a Magnafuel 300 pump, according to Mganfuel it was marginal for feeding 700 HP using E85 
so I bought a 500 pump to be sure, I will probally end up with two Ron Terminators on it on E85 in the future so the 500 pump will be adequate to feed those via a sump tank control by a float for the belt driven pum to feed off of 
so I bought a 500 pump to be sure, I will probally end up with two Ron Terminators on it on E85 in the future so the 500 pump will be adequate to feed those via a sump tank control by a float for the belt driven pum to feed off of
Posted By: emarine01
Re: Fuel flow thru reg? - 06/17/13 02:16 PM
I retested the BG 280 this morning and had the same results as yesterday, gal in 19 secs & 7 psi, I let it run dead headed @ 18 psi for 15 min and the pump motor was a little warm but not hot, amp draw was 13 to 14 @ 13.5 volts , pump still a bit loud, When testing I removed one flex line from the fuel log feeding the primary bowl, The fuel blasts out the line like a fire hose, This is a 6an flex line that y,s together after the reg, From looking @ the fuel flow I cant see how the float bowl cant maintain the level from the amount of fuel flowing out the line, took the needle out and checked for a clog, All looked good, Could it be that the float is not reacting fast enough? The old needles were .110 & I went back with .120s thinking the bowl would fill faster, The Holley reg has a .220 restriction the .120 needles x 2 =.240, The BG reg is larger but I don't know the size, The fuel log is attached to reg with a inside dia of .340 @ the entrance to the log than y,s off to the bowels, is this too small?, a # 8an line will flow more volume @ 7 psi, Its just hard to figure that this small block can need this much fuel, in the past the engine consumed 1 gal in the 4 mins we ran to make a pass, that's from the pits to staging, a 200ft blast and back around to the pits, That's been consistent for the past few years, Anyhow has anyone had a problem with a 6an fuel log being too small?
Posted By: bonefish
Re: Fuel flow thru reg? - 06/17/13 03:27 PM
my 520 ci. big block has 6an to the carbs and a holley big reg.it,ll run 9.30,s all day long with no prob.i have 120 needle and seat.
Posted By: MR_P_BODY
Re: Fuel flow thru reg? - 06/17/13 03:29 PM
The #6 line wouldnt be the problem BUT the Y might be
on the small side... all the AN fittings I use I normally
drill them out some so its just inside the seating area
on the small side... all the AN fittings I use I normally
drill them out some so its just inside the seating area
Posted By: emarine01
Re: Fuel flow thru reg? - 06/17/13 03:52 PM
Quote:Is it 2 / 6an lines, one from each port from the reg, or one 6an split to 2 bowels?
my 520 ci. big block has 6an to the carbs and a holley big reg.it,ll run 9.30,s all day long with no prob.i have 120 needle and seat.
Posted By: bonefish
Re: Fuel flow thru reg? - 06/17/13 04:13 PM
Quote:two seperate lines,one from each side of the reg.Quote:Is it 2 / 6an lines, one from each port from the reg, or one 6an split to 2 bowels?
my 520 ci. big block has 6an to the carbs and a holley big reg.it,ll run 9.30,s all day long with no prob.i have 120 needle and seat.
Posted By: Thumperdart
Re: Fuel flow thru reg? - 06/17/13 04:33 PM
Quote:I used to set up motors on Pettis`s dyno and some of the baddest had #6 lines and we tried #8 w/zero difference however on my junk I went by the Mopar Bible and have #10 to reg. and #8 to each bowl.............Quote:Is it 2 / 6an lines, one from each port from the reg, or one 6an split to 2 bowels?
my 520 ci. big block has 6an to the carbs and a holley big reg.it,ll run 9.30,s all day long with no prob.i have 120 needle and seat.
Posted By: jyrki
Re: Fuel flow thru reg? - 06/18/13 07:14 AM
The restriction that all the fuel goes through in a basic Holley regulator is what, 1/16"? It is not enough to be able ot correctly feed todays high performance engines, I would say it's only good for about 600 hp. The old pro stockers didnät make that much power, and they had one reg for each carb.
Posted By: emarine01
Re: Fuel flow thru reg? - 06/19/13 01:03 AM
2 6an lines one off each reg port to each bowl seems to have solved the problem, But she source of the problem was a kinked line @ the 90* bend to the front bowl that was hidden by the SS cover on the fuel line, When I did the flow testing I dropped that line and straightened out the 90 to go in the bucket thus fixing the kink, I found the kink from cutting the line to shorten it 
This was nothing but a frustrating fire drill where the testing made no sense, Thankx to all for the help.
This was nothing but a frustrating fire drill where the testing made no sense, Thankx to all for the help.
Posted By: Clanton
Re: Fuel flow thru reg? - 06/19/13 01:40 AM
LOL go have some fun now!
Posted By: Thumperdart
Re: Fuel flow thru reg? - 06/19/13 05:56 AM
Quote:Been there............can drive you nutser for sure but hey you found it.
2 6an lines one off each reg port to each bowl seems to have solved the problem, But she source of the problem was a kinked line @ the 90* bend to the front bowl that was hidden by the SS cover on the fuel line, When I did the flow testing I dropped that line and straightened out the 90 to go in the bucket thus fixing the kink, I found the kink from cutting the line to shorten it
Posted By: bonefish
Re: Fuel flow thru reg? - 06/19/13 03:31 PM
thats the kinda stuff that happens to me.just went thru the same thing with a coil wire.worked great when i grounded it out but put it back no spark.changed coils ,dist,finally figered it out.
Posted By: Cab_Burge
Re: Fuel flow thru reg? - 06/19/13 06:35 PM
Quote:Lots of gremlins out there, the simple stuff will kill you trying to find it
2 6an lines one off each reg port to each bowl seems to have solved the problem, But she source of the problem was a kinked line @ the 90* bend to the front bowl that was hidden by the SS cover on the fuel line, When I did the flow testing I dropped that line and straightened out the 90 to go in the bucket thus fixing the kink, I found the kink from cutting the line to shorten it
