Here's some pics of my dual pump setup using twin stock FD pumps. I used 10G wire and bypassed the stock connector by drilling holes and using grommets, then used 2 heavy copper ground straps to link the elect posts on the 2 pumps.I already have a direct wire from the battery using a relay triggered from the stock FP wiring.

For the fuel part of it I cut the stock metal tube and slid high pressure 5/16" hose several inches over the tube and clamped it good with multiple hose clamps. I used a heavy duty Y splitter made from some sort of composite plastic that's fuel safe. Then ran the lines to the two pumps. Used large hose clamps to clamp the pumps together to the bracket. The pics were taken before I centered the pumps on the bracket so they would fit inside the tank, as well as before I coated and wrapped the hoses with fuel safe sealant. I also used sealant at the grommets. Overall cost was about $45 for the pump, extra sock, and sealant, already had the wires.

 

Nice work....where'd you get the grommets? Is the rubber compound rated for fuel service?

 

The groomets came from a kit i got from a traveling tool sale. I'm not sure if they are fuel safe but the sealant i covered them in is.

 

I wonder how these will hold up versus say a Supra TT pump.

what are you going to be running them at?

 

Both the supera and rx7 pumps are made by nippondenso and are reliable and quiet pumps. Should hold up well. Two stock pumps are supposed to flow enough for 600+ hp in this type of configuration. Actually one rewired stock pump will flow a lot more then people give them credit for. I could probably get even more out of the setup if i ran one per rail, but don't want to go to the trouble if it's not needed. I plan on increasing my base pressure enough for my 550/1680's to support enough for 23 or so psi with my t70. Should be over 500 hp. Maybe around 550. Will have to see. Need a new clutch for those levels.

 

Excellent idea! Good job on doing something outside the norm.

Did you happen to see CrispyRX7's wirteup on his his dual pump setup? interesting steps he took on the wiring and plumbing.

 

Thanks. No i can't say that i did see his setup. Unless his was one with the AN lines, i think i remember seeing one like that that was dual pump. Can't remember if it was with stock pumps though. Personally i think its an economical way to get a lot of fuel. I have a fuel pressure guage mounted in cabin to keep an eye on everything too.

 

Can I get a part number on your 'Y' splitter? I'm trying to hunt one down but not having much luck. And are you running a FPR with this setup?

 

He'll probably chime in but here are some y-fittings. 5/16 = -5an

http://www.jegs.com/webapp/wcs/store...allpartial&N=0

I can't imagine a local Autozone or PepBoys wouldn't have one. /shrug

 

I can remember where I ordered mine from. It was similar to the above except had barb fittings and made of a durable black plastic. was either 5/16 or 3/8.

Yes i'm running an aeromotive FPR

 

will this work for the Y fitting? or is 3/16" ID too small? Link

 

The only barbed fitting I could find is ~$40 from McMasters...so if anyone has any other ideas of where to source one let me know.

http://www.mcmaster.com/#2653k19/=5nroia

I believe the stock lines are close to a 5/16 or 3/8 will suffice as well I assume?

Thanks for the help

@Chudsoncoupe

I don't believe 3/16 will work. 5/16 or 3/8 would be desired, though I'm double checking

 

Also, I remember seeing a write up that showed a fuel proof terminal that allowed one to avoid using grommets and fuel safe sealant for running 10 gauge wire through the cover and into the pumps. But I cannot find these online.

In the pic below, grommets and sealant were used to get the new wires to the pump. Does anyone know where to find the terminals that make it so you don't have to do this? I remember them being like a speaker connector, you'd drill a hole in the fuel cover, slide it through, put a nut on the bottom and tighten it down (now no leaking through the cover), a threaded post would be sticking out the top of the cover with a horizontal hole for the wire. Slide the wire through the post, tighten down a nut on it and its all connected, no grommet or sealant needed.

 

i'd trust two stock lower mileage pumps over two walbros any day just because it seems like there is more consistent quality control. the stock pumps don't seem to have a very high failure rate, I had a stock FD pump with 130k on it in my non turbo 2nd gen.

 

Every car I've owned has had a 255 wally in it, and I've put them through hell and back in terms of running the tank below 1/4 and switching to E85 etc, as long as you have it rewired and it sees constant good voltage I think it'll do just fine.

 

the fuel pump whine gets irritating on walbros

 

i can get a brass 5/16 y fitting localy, is brass good? and also can i just use the stock wires or is it a must to use 10 gauge wire?

 

just upgrade the wires whire you are in there. its good insurance

 

Brass is fine. Upgrade the wiring to the pumps if you can. Upgrading the wires to the cover and then leaving the stock, hair thin, wires from the cover to the pump makes no sense to me. Take a look at my website: www.reganrotaryracing.com use the drop down menu to find the fuel pump page.
Regards,
Crispy

 

found a fuel resistant "y" connector

http://www.jrgraham.com/itemdetail.d...l&itm_id=19454

 

Crispy, no offense, your website needs some tlc text is incredibly difficult to read when its on a background like that AND center aligned.

also, other ways to improve:

- condense the pull down menu.
- alphabetize it.
- make each of them links with sections and titles and do away with the pulldown altogether.
- change text font to Verdana or Arial and break up lines a little more.

tho it has not stopped me from spending gobs of time browsing while at work

excellent info as well, so dont let my web dev antics throw ya

 

Oh you aren't kidding!!! But alas it's the best I can do. Last time I counted I had over 50 pages buried here and there on my site....I've been adding to it piecemeal for over a decade. When I threw some info up on the web I had no idea it would grow to it's current size.

I actually went through a huge reconstruction when I moved the site a couple of years ago....and it took me two weeks. I actually have 6 more pages under construction that I've been trying to get done for the last 6 months! I don't have the time.

I have been meaning to at least alphabetize the drop down. As for your third suggestion, it's already there if you use the sections listed on the left side of the front page.

Here's an idea....wanna help with a rewrite?
Regards,
Crispy

 

Nicely done. 