Thanks, for answer.
I am relocating battery to trunk, so wiring will not be long.
I think i will try to sell pump forward.
Other idea is to use two pumps to feed engine?
JP
Lemme preface this with I have not been doing this years like many other knowledgeable people here. However I just went through the whole process you are going through myself.
Here is the pros and cons of 1 vs. 2 pumps:
1 Pump
Pros
*Less wiring
*If pump fails motor simply shuts off and doesn't go lean
*less plumbing (not hugely significant)
*easier to mount in tight spaces (pending the pump
*Amp draw on the system will be less than 2 pumps (Figure 1 pump drawing 18amp vs. 2 drawing 15amp)
*Only need 1 speed controller (if even needed)
*1 large pump is typically less than 2 smaller pumps when all is said and done (fittings, etc)
*If pump is capable of handling higher voltage and you upgrade later on, voltage boosters (Kenne Bell, etc) will typically allow for a significant enough amount of flow gain to negate the need for a new pump.
==For example lets take my fuel pump the Weldon 2345a. At 14v it is supposed to flow 200gph@ 80psi, and at 16.5v it flows 240gph! These work all the way to 18v too! So if my math is correct, for each additional volt above 14v you gain 16gph. So 2.5v X 16gph (per volt)=40gph gain. So if you ran it to 18v with a volt booster, you could hit 264gph (assuming all is perfect.) The cool thing is, Weldon pumps come with flow sheets and the date they were flowed, so you see proof what it flows, and some flow more than others!! 200gph is just the baseline requirement. My pump flowed 255gph@ 16.5v, so each volt above 14 added 22gph, an extra 15gph over normal!!! So if I were to hit 18v, I would see 288gph!!
**My point with all that was to show that if you get a properly sized pump right now, and upgrade later, depending on what pump you get, you can still have plenty of room for expansion!
Cons
*Pump is very large will typically need a controller (otherwise will overheat pump)
*If your pump fails when you're out driving, you're stranded (although that could happen with a million things)
*Could heat up the fuel quicker if running a small gallon fuel cell and potentially lead to vapor-lock
*I'm sure I'm forgetting quite a bit*
Expensive initial investment
2 Pumps
Pros
*Will flow enough for what you need and then some (pending pump, and 1 pump can also do this as well)
*You could run a check valve inline after 1 pump and when cruising on the street, only use 1 pump. This would save from heating the fuel, as well as not wasting amp draw from 2 pumps (not that it will be significant anyway, but hey, maybe you have a stereo or something?)
*If you wanted to go to the track, just have a toggle switch and turn the 2nd pump on and you're good to go
Cons
*Need of 2 controllers if running both pumps all the time (If you only 1 run all the time, and do the checkvalve method, you would only need 1 controller because the 2nd pump would only be on at WOT runs)
*If you run the checkvalve method with toggle switch and forget to turn the 2nd pump on, you blow your engine
*If one pump fails your engine goes lean and melts pistons
*Cost is the same, if not more than 1 pump when you add in controllers, etc
*If you ever did a volt-booster to the dual pumps, you would need 2 volt boosters (or the expensive dual ones, which are about the same as 2 individual ones)
*More things to go wrong (wiring, plumbing, etc)
I personally priced almost every option out that I could think of. It was either 2 pumps that would barely suffice (Aero Pro Series) that were warrantied for E85, and I would need 2 controllers and eventually 2 volt boosters, or 1 big pump that I would never run out of fuel.
In the end it was simple dollars-and-cents, and I actually came out with (arguably) the best and biggest electronic inline pump there is! Not only that, but it cost me less, I didn't need a volt booster, or a speed controller, and it will work to 18v if I ever need to expand it.
So just think about it and call around to different fuel pump companies. hahah I have all their numbers if you need em
I think doing dual inline pumps with a checkvalve and a toggle switch to turn on-off the 2nd pump would work. Price it all out (include fittings and feed line, because most take -10 or -12 and it gets pricey fast. A nice radius fitting can be 15$ for 1 fitting!)
I don't know if any of this helps, but this is kinda what I went through in my head when looking at all this stuff.
Lemme know if you have any questions. There are also a ton of people in this section with great knowledge! Checkout my build thread in this section and maybe that'll show you where I'm coming from with my fuel pump choice.
