FUEL distribution Y-BLOCK ???'s

[andy4g63]

OK, I am in process of upgrading a little my fuel system, which already been upgraded. Mods are in my profile.

I have a sumped 1G fuel tank with 2 -10AN fittings on it. I am going to use dual Bosch 044 fuel pumps in paralel.
First, I wanted opinion on how would transition of size to size would affect flow. I am going to go from -10AN into the pumps to -8AN OUT of pumps and this is going into Y type distribution block. I noticed, that most of the Y blocks are 2 smaller sizes, going into one bigger:/ two-6AN into one -8AN, or two -8AN into one -10AN/.

The problem is I want to use my existing single -8AN feedline, so I intend of using two -8AN into single -8AN Y-BLOCK.

Is this going to affect flow somehow???
Of cours, I could use two single -6AN coming out of both pumps and going into -8AN Y-block.

But I definately keeping my -8 feedline.

I will probably upgrade my fuel rail to a FIC. I have stock rail with -8AN on both sides, also Aeromotive filter. So since I am going to upgrade the fuel rail and the fuel filter has -10 outlet, is it going to be OK to make it -10AN from filter to RAIL, or leave it -8 AN,as it is. Because I see a lot of the vendors, that offer FIC fuel rail have it with different fittings, but the are bigger on the INLET side of fuel rail and smaller on the OUTLET side. Is there any reason for that ???

So let's sum it:

Sumped tank>-10AN to dual Bosch044.
Dual -8AN out of pumps to a single -8AN Y-BLOCK
From there -8 to fuel filter, then-10AN out of filter into fuel rail and -8AN out of rail to the AFPR and -6 return to tank.

THANKS for your time, Andy.

 

[turboglenn]

you should be fine... having a larger hole fto feed the pump is never as bad as to small a hole (or making them pull uphill....DON'T DO THAT) they cna push uphil, but mount the pumps almost level with the sump or only a few inches abpve so that your fuel level is higher than the pumps..this keps strain off them.

as for the choices in "Y" fittings.. you may have to come out with dual -6's (the hole in the pump isn't any bigger than a single dash 6 anway...then "Y" them into the -8 Too big of a fuel line cn hurt when it's taking up much of the volume you need at a particulr flow.

EDIT..on second thought... if you can get the AN fittings with a smaller pipe thread (bigger than 1/8th but smaller than 3/8 (i think it's 1/4 inch, but i just woke up) then get an aluminum block in the shape of a Y and drill it internally, then thread it for the fittings.

If you don't have the machines i''d be glad to help you out. I've got about every tap and drill out there! (but new yorks shipping back and forth might not be worth it. THere's always the guy on here who made his from a "Y" fitting for an air compressor and threaded AN fittings to it...don't remember the name of the post though

 

[twicks69]

Here are two options I would look into:

#1: Use your -10AN feed fitting/line to ONE Bosch 044 mounted near the tank, then -10AN feed up to the firewall. Then use your second Bosch 044 near the firewall (or just before your front cross member) with its -10AN feed. Then you would have your -10AN fuel filter to a -10 feed fitting on the fuel rail. You can use a -8AN or -10AN fuel return line with no issues. Essentially, you will use your fuel pumps in series to give you the capability of running really high fuel pressures while retaining its efficiency at low duty cycles. Using fuel pumps in series boosts the efficiency of the fuel pumps because one will not have to suck as hard to get its fuel (it is already under pressure from the first pump). This setup can handle MUCH HIGHER boost pressures than the example #2. This fuel setup with capable fuel injectors will do WELL OVER 1000whp.

#2: Use each Bosch044 in parallel with its own dedicated -8AN feed line and its own fuel filter in-line. Instead of using a y-block, you can use both of the existing inlet/outlet ends of your fuel rail, and center drill the fuel rail with an additional -8AN fitting. This center mounted fitting will now be used as your -8AN return line. This fuel setup will be limited to the maximum pressure of each pump which is approximately 5-bar (or 72.5psi max efficient operating presure). This limits you to a 29psi boost pressure at a 43.5psi base fuel pressure to keep efficient.

Of course, your setup will work, but these two are also very efficient.

#3: Use a 2x -8AN to -10AN y-fitting. DO NOT use a -8AN to -8AN y-fitting, as it will be a flow restriction if you actually put the real capacity of the fuel pumps to work. This will dramatically hinder its efficiency at its maximum levels.

If you end up with only ONE -8AN feed line going into the fuel rail, I would reccomend a -6AN return line from the rail to the regulator to the tank. If you are going to use two -8AN feed lines into the rail, I would reccomend a -8AN return line to the regulator, and to the tank.

 

[andy4g63]

Thanks, guys. The problem is, I still want to use my -8 feed line. At my power level, I wouldn't need more. What about dual-10's from tank to 2 pumps/parallel/, > then two -6 out of pumps/because outlet of the Bosch 044 isn't any bigger/ and these two-6 going into Y with -8 and connect it to my -8 line.
Then from filter ro rail, Iam going to use -10 and -8 to AFPR and-6 return from AFPR to tank...

I wanted to use my existing stuff, not buy new one.
Even right now, I have Wallbro in-tank, feeding Bosch 044 in-line, is more than enough. I just want to Put the sumped tank and obviously replace the Wallbro.