Fuel pump selection

[jsj372]

I recently upgraded my N20 system to the Prorace fogger using the .028 jets (approx 250ho set up). I was previously using a Cheater system. I was told that I could retain the current fuel system. I am using the Mallory 140 dedicated on -10 line from fuel cell to regulator then -6 to each bowl of the carb(engine makes about 600hp). For the nitrous I have a Holley Blue dedicated on -8 to the regulator and then from regulator to the solenoids on -6. Will the Holley Blue pump be enough to only feed the Fogger system? According to the Holley formula, it should be more than enough. But I want to get the opiions of people who have been down this road before. The Mallory would be dedicated to engine and the Holley dedicated to the N20.

[underdog]

If the holley is at the back of the car, NO, it's not big enough. If it up in front of the engine, then it's good for up to about 350hp shot of nitrous. Holley's formulas doesn't take into affect "G" forces you'll have when you leave the line, the size of the line and the distance of the line would determine the weight of the fuel pressed against the pump, a modified BG 400 pump will work, or a MagnaFlow 300. I question if the Mallory is big enough also. I used to use a 140 and it was fine with a 550 hp N/A combination, but on the spray the "G" forces would be greater so I'm not sure if it would keep up to fill the bowls or not.

[85Camaro]

I moved my 140 up front to support the Nitrous system and replaced it with a 250 to support the motor. One thing with mallory stuff make sure you get the good regulators(black regulators) or you will have problems the 2 ports suck.

[jsj372]

If the holley is at the back of the car, NO, it's not big enough. If it up in front of the engine, then it's good for up to about 350hp shot of nitrous. Holley's formulas doesn't take into affect "G" forces you'll have when you leave the line, the size of the line and the distance of the line would determine the weight of the fuel pressed against the pump, a modified BG 400 pump will work, or a MagnaFlow 300. I question if the Mallory is big enough also. I used to use a 140 and it was fine with a 550 hp N/A combination, but on the spray the "G" forces would be greater so I'm not sure if it would keep up to fill the bowls or not.

What pump/s do you recommend if mounting them at the rear of the vehicle? What size line/s?

[Monty Mikho]

Throw both pumps out and get a nice single pump for the rear of the car. I used a modified BG 400 pump to support a 950 HP motor on 2 stages using 28 pills in both. It was more than enough pump for everything. I also used a Weldon 2035 pump to support the same and also that pump to support the same with EFI on a single stage with a 860 HP motor. I am not a fan of having two pumps in the car. 2 pumps means twice the possible problems, weight and voltage drain... If you are going to buy a new pump buy a good one.. Otherwise you can try making what you have work.. Not saying it wont..

[underdog]

Monty is right, go with one big nice pump. I currently have a 300 MagnaFlow in the rear for engine, and a MagnaFlow 280 up front for the fuel side of the nitrous. To do it over again, I'd buy the MagnaFlow 500 or 600 or the Weldon.

[Monty Mikho]

:oops: Thats right I used a MagnaFlow 500 (MagnaFuel now) in the rear of the car also. All of the pumps worked great.. Even the BG crap worked with no problems..

[jsj372]

Ok heres the latest... Got a Magna 500 and a 4 port regulator. What size line from the pump to the regulator? Pump is at the back of the vehicle. So this setup should feed the Engine and Pro race fogger? Also I have 2 #8 outlets from the cell, should I use both of these and "Y" it into the pump or get 1 bigger outlet for the Cell? Thanks alot guys.

[Griswald]

Separate regulators for the motor and nitrous. The $25 Holley regs work as good or better than any others.

[jsj372]

What line do i feed the holley regulator with and where do I supply it from?

[Griswald]

Best bet is to use a fuel log and mount each regulator there. One main inlet to the log #10 and then #6 to the carb and each solenoid.

Something like this:

http://www.magnafuel.com/products/kits/MP-9540-9575.jpg

[YDLUZ]

I ran the 2 8's out of the cell to a Y at the magnafuel 500 pump, -10 from the pump to the front (that's what magnafuel wants) another Y with 10an to each regulator, ea is a holley $20.00 reg, 8 an to each carb bowl. 8 an vent on cell!

I feed a 625hp mtr and 350 shot no problem at all.

.....on a side note, I run a bleeder line off the nos fuel reg so it's not dead headed / pressure spiked on the hit, have a little .020 jet in there, works really good. Opinions vary on this, but I like it.

[8TREEZ]

I run a bleeder line off the nos fuel reg so it's not dead headed / pressure spiked on the hit, have a little .020 jet in there, works really good. Opinions vary on this, but I like it.


Where do you return your bleeder line to?

[Griswald]

I run a bleeder line off the nos fuel reg so it's not dead headed / pressure spiked on the hit, have a little .020 jet in there, works really good. Opinions vary on this, but I like it.


Where do you return your bleeder line to?

Back to the fuel cell.

[8TREEZ]

Back to the fuel cell.


How big is the line #3 #4 #6 I need to add a bleeder line and I would like to know how you did yours... Pics would be Cool!! 8) Anything would help. Thanks

[Griswald]

How big is the line #3 #4 #6 I need to add a bleeder line and I would like to know how you did yours... Pics would be Cool!! 8) Anything would help. Thanks

run an 1/8th" 90* fitting from the solenoids via some #3 braided line to a T, then adapt that to hard brake line and run that to the back back of the car or wherever your cell is. Then pick it back up on another #3 line and into the fuel cell. Your local hotrod parts counter should have all the stuff.

Look closely at this picture and you can see the lines coming off the solenoids.

http://centexhotrods.com/clark/8232004/823200415.jpg

Notice here the small line feeding into the top of the cell.



http://centexhotrods.com/clark/tubs/trunk1.jpg

[8TREEZ]

Thanks For the photos I had a pretty good idea but that sealed the deal...Thanks :D

[Beyond]

He forgot to mention on the outlet of those elbows fitted at the solenoid, grind the tip of the AN fitting off and drill it out to fit a jet in there. Doesn't need to be a very big one, like .018 or so. The line will have a #3 end on the solenoid side and a #4 on the Y end. Just thought I'd toss those little details in.

If you need the fittings give Mike Nelson over at Nitrous Supply a call, he'll even drill the elbows out for you and fit them for a jet.

[YDLUZ]

I just used an old -4 nos line I had - I'm kinda wondering if that's okay, okay for use with gas? I think I called nos and they said it would be fine, but the mind is the 1st thing to go, so I'm not sure!

[Beyond]

Yeah, that'll actually work better. It'll last longer for sure and they are a lot easier to put the fittings on I think.

[monte_kev]

I am running a magna 500 to a magna fuel block.

on the magna fuel block it is a -10 female, if I put a male -10 in there the fitting sticks into the fuel flow, is this acceptable? whouldn't a fast flow npt fitting been a better option?

or since the fuel will still flow into the regulator and then be regulated it doesn't effect the fuel flow in anyway...

thanks guys