fuel systems ? 2 255lph - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 24 Old 07-25-2007, 10:00 AM Thread Starter
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Talking fuel systems ? 2 255lph

I know its possible to use 2 of the walbro 255lph pumps, but how do you mount them inside of the tank? and i have seen pics somewhere on here where some one had mounted them on the front of the tank, does anyone have any pics that they would like to share? Also I was going to use some-10line that i have how big should the return be? Also I was going to use the oem pressure line for the return but i think that it might be too small.
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post #2 of 24 Old 07-25-2007, 01:15 PM
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I'm running 2- 255lph pumps w/ one being a in-tank pump and the other and in-line pump. If you are going to be running new fuel lines, i would sump the tank and run 2 pumps in parrallel w/ the -10 line and use a -8/6 for the return.


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post #3 of 24 Old 07-25-2007, 05:43 PM
 
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or you could just do like i did and buy one A-1000 pump and be done with it
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post #4 of 24 Old 07-25-2007, 06:53 PM
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A-1000s have lots of issues from the searching ive done on here. I used twin pierburg 255 pumps. The pumps suck thru a single -10 that is tee'd to the pumps. They push thru another aluminum block tee that feeds a -8 line up to the motor. A lot of people use the factory feed for the return, I just ran a -6 because my lines were shot. Basically very similar to a cartech renegade stage 3 system.

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post #5 of 24 Old 07-25-2007, 06:55 PM
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also used an aeromotive fuel filter and a -6 fuel cooler in the return. Remember, using AN hose insulates the fuel vs. factory metal lines which radiate heat so its a good idea to run a fuel cooler in the return. They are only like $30.

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post #6 of 24 Old 07-26-2007, 03:13 AM
 
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or you could just do like i did and buy one A-1000 pump and be done with it

Two 255lph pumps will be good for more than a single A-1000.
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post #7 of 24 Old 07-26-2007, 09:29 AM Thread Starter
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thats interesting mark c how much more i wonder,?? bike wiz would you happen to have any pics that you want to e-mail that is very similar to what i was thinking about. I was wondering if the pumps would be getting hot because they aren't in the gas ? What problems do the a1000's have. I thought that they were supposed to be like the world wonder pump or something. The reason that i was wondering about the 2 255's is because i already had one and they are cheaper then the a1000, even though it looks cooler
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post #8 of 24 Old 07-26-2007, 10:57 AM
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I run twin 225pumps mounted on a flat plate that is mounted to the rear trunk panel

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post #9 of 24 Old 07-26-2007, 01:01 PM
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Quote:
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I run twin 225pumps mounted on a flat plate that is mounted to the rear trunk panel


that's how I did mine too...

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post #10 of 24 Old 07-26-2007, 03:16 PM
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Stephen,
what size pushlock fuel line are you using from the pumps to the y block? can you post more pictures?


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post #11 of 24 Old 07-26-2007, 03:57 PM
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I run two Walboros in my fuel cell. I drilled and taped the bulkhead fittings and hooked the pumps up with a short length of hose. On the other end I have a metal plate the goes over the pickups and holds the ends together. A stock prefilter(sock) holds the plate in place. One 255lph pump runs all the time and the other one turns on with a Hobbs switch that I have set at 8#s right now. Outside the bulkheads I have 6an lines running to a Y block, into a filter, and then a single 8an push loc hose up to the engine, more 8an is used for the return. I was not sure if I was going to stay injected or go carbed so I ran a large return to handle the extra flow. It works well so far, and like was stated above I already had one of the pumps so I just needed to buy one more. I have a pretty kick ass fuel system for not a lot of money.

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post #12 of 24 Old 07-26-2007, 04:52 PM
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The fuel system I have is from glenns performance. I have the stealth tank, and twin 255's. Very similar to what 'stephan wehner' is using.

And the push-lock hoses are great too!!
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post #13 of 24 Old 07-26-2007, 05:06 PM
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The fuel system I have is from glenns performance. I have the stealth tank, and twin 255's. Very similar to what 'stephan wehner' is using.

And the push-lock hoses are great too!!
is the push lock hose -6 or -8 an?

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post #14 of 24 Old 07-26-2007, 05:17 PM Thread Starter
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some of you guys have thought this one out, well the pics are very helpful, the blue hoses look really nice, I am thinking that you could run the 2 , 255's and 2 sets of the oem lines until after the filter ? then y block it into 1 line?
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post #15 of 24 Old 07-27-2007, 02:09 AM
 
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thats interesting mark c how much more i wonder,?? bike wiz would you happen to have any pics that you want to e-mail that is very similar to what i was thinking about. I was wondering if the pumps would be getting hot because they aren't in the gas ? What problems do the a1000's have. I thought that they were supposed to be like the world wonder pump or something. The reason that i was wondering about the 2 255's is because i already had one and they are cheaper then the a1000, even though it looks cooler
Seriously this site has some of the worst spam control I've ever seen. No matter what I write it thinks I'm posting a URL.

I'm going to make this easy.

Assuming you have a 45psi base pressure and run 15psi of boost with a 1:1 regulator (which you should be running)...

A Walbro 255 at 60psi of pressure usually flows about 240lph.

If you check out aeromotive's page (which I would have linked you to if this site didn't insist I was spamming) you can see that the A1000 flows a bit less than 550 pounds per hour at 60psi.

To make things equal we will use a specific gravity of .746 (this is the specific gravity of VP Street Blaze 100). This means that a gallon of this fuel will weigh approximately 6.23 pounds, which means the A1000 flows approximately 88.28 gallons per hour aka 334.14 liters per hour.

Two walbros will flow approximately 480 lph at the same pressure yeilding approximately 44% more fuel flow.

Obviously the numbers are not exact, this assumes 13.5 volts for both setups.

And this has officially been one of the most annoying posts to write in my life having to post it with every number written out and come back and edit the numbers back in one by one.

Last edited by Mark Conte; 07-27-2007 at 02:14 AM.
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post #16 of 24 Old 07-27-2007, 09:42 AM
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Quote:
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is the push lock hose -6 or -8 an?

It is -6 for both feeder lines and -6 return. Really simple fuel system IMO.

Mark Conte-That is some good info, thanks for posting.
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post #17 of 24 Old 07-27-2007, 10:52 AM Thread Starter
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i like info now we are learning stuff. I have a 1.1 regulator and 60# injectors so my fuel pres isnt that high. I have not had a problem with the copy and paste yet. my only complaint is that you have to have a pic hosted some where else and then link to it.. Oh yea what is a good place and name brand of a fuel cooler and where to mount it, newbie on that one .. and oh yea mark if you have things that will not copy and paste on here them e-mail them to me that goes for anyone with the fuel sys pics and helpful ideas also to [email protected]

Last edited by smurfmobile8586; 07-27-2007 at 10:56 AM.
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post #18 of 24 Old 07-30-2007, 11:21 PM
 
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No prob guys, with 60lb injectors and two Walbro 255lph pumps your fuel flow is fine for 800hp as long as you really don't jack up the pressure. I will say if you start going farther with it (1000-1200hp) I'd recommend moving to a Weldon A2040 regulator for its .281 orifice and -8 return.

On a side note, normally injectors are rated at 43psi, if you're running significantly lower pressure than that, you should recalculate their flow, which is done as follows:

Take the new pressure divided by the old pressure. Take the square root of that number and multiply it by the old 'rated' flow.

Example:

60lb per hr injector at 43.5 psi is run at 30psi

30/43.5 = .6897

.6897^( 1/2 ) = .8305

.8305 * 60lb/hr = 49.83 lb/hr (good for 650-700hp as opposed to 800) - not to mention the spray pattern on an injector isn't as good when run at a lower pressure.

Do keep in mind though not all injectors are rated at the same pressure, Mopar injectors (like the upgraded ones they sell for the SRT-4) are rated at 58psi if I remember correctly.

Last edited by Mark Conte; 07-30-2007 at 11:25 PM.
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post #19 of 24 Old 08-23-2007, 12:36 AM
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fuel

So 60lbs and twin 255s are good to 800rwhp ?Because thats what i'm looking at with my new setup for my cobra.

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post #20 of 24 Old 08-23-2007, 05:36 PM Thread Starter
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what would pushing it be as far as power was concerned? 950 rwhp?? i was thinking that the 255lph's were good for like 550
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post #21 of 24 Old 08-23-2007, 05:43 PM Thread Starter
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y blocks are freeking expensive
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post #22 of 24 Old 08-24-2007, 08:08 AM
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Quote:
Originally Posted by 97svtsnake View Post
So 60lbs and twin 255s are good to 800rwhp ?Because thats what i'm looking at with my new setup for my cobra.
I would think in that area, a buddy had a 93 vert running 10.50's in the 1/4 (now down to 10.20's) with 2 of the 255 inline walbro's and 55 # injectors. Rest of the combo was 347 with 14-15# of vortech SQ in an AOD car.

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post #23 of 24 Old 08-29-2007, 09:31 AM Thread Starter
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do the external pumps have to be gravity fed?
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post #24 of 24 Old 08-29-2007, 10:33 AM
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I believe you are supposed to mount them lower than the sending unit fittings. I have mine mounted on a plate just inboard of the RR lower torque box. I can get away with this because I run the SLP Loudmouth exhaust, so I have the clearance where the stock muffler would be.

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