Unlike hot blondes, two is not always better... when it comes to fuel pumps... Fuel system design is a conversation I have with customers on a daily basis (sometimes multiple times a day) so I thought I would shed some light on the topic.
Disclaimer: I am not saying that there are setups out there that are contradictory to my statement working at the top of their game, but from a point of view of a new setup that is most efficient and simplified with a minimal chance of failure, these are our findings.
When pushing 1000-2000hp+ numbers on today's combos both street and race (is anyone building a car to make less than 1000hp anymore?), all onboard vehicle systems must be up to the task at hand... That said, the fuel system is a very common overlooked or "pieced" together component, however, one of the most crucial. Most of us started out with "cam only" and other closer to stock setups, slowly progressing into 9, 8 and 7 second rides. It's very appealing to just add a second in tank pump (or a couple of inexpensive external pumps) to "get you by". Customers will tell me "I'm just trying to put things together as inexpensive as possible". On the flip side, I also see very capable and expensive components improperly used, or on poorly designed systems that can be every bit as troublesome.
The real truth is you cannot afford to have an inexpensive (read unreliable and inadequate) fuel system) or poorly designed system. You WILL eventually pay for it in part rebuy or parts failure.
The most common scenario we find are with in or out of tank budget dual pump setups is failure of one pump. In this situation your car will startup, drive, sound fine, and make great power, right up until you need the extra fuel on one unassuming instance. At this time as you are pushing for more boost and hp, the pistons are going to scream for help giving you some great garage art conversation pieces which may or may not also include Pistons, cylinder heads, turbo or all of the above. Again this is a scenario, one that I get calls to troubleshoot often.
The next point to be made are the plumbing of said combos. Cost concious persons (aren't we all) call wanting to run 2, 3, 4 small pumps to save a few dollars or fit into a stock unmodified tanks. They then hand me their plumbing schematics for quote, and it is at this time that the instant savings is gone most EVERY. SINGLE. TIME... There are more problems associated with multiple in tank pumps such as working against gravity with no sump, trying to pull fluid out of small orifice against gravity, too small of shared feed, and the list goes on, but I digress.
What we learned long ago, on most boosted setups under 1600 fwhp gasoline, was one single pump such as the Magnafuel 4303 (http://www.motionraceworks.com/store/p68/Magnafuel_Pro_Tuner_750_%28Part_%23_MP-4303%29.html) will far exceed a multi unit system, and save you DEARLY in fittings, line, and other components necessary to make the fuel flow PROPERLY.
Now that we have addressed a few of the common scenarios, let's talk about what will minimize your heartache, busted knuckles, and overall cost of parts (both short and long term). Like most mechanical parts, fuel system components are designed to operate under certain conditions, including orientation, feed and exit orifice sizes, voltages, run times, to name a few. In fact many pumps out there today are well engineered and performing pieces but take the blame for all of the above.
Bottom line is that fuel system components receive a very large demand from our horsepower hungry combos, and are many times not given enough consideration in design.
Motion Raceworks is commited to designing fuel systems for our customers that will not only meet or exceed their performance goals, but will work for years to come on current and future combinations. If you are in the market please shoot us an email to firstname.lastname@example.org. We are happy to put together a quote or build you a system using the industries best and most reliable components which are selected by us to meet your individual needs.
With a small amount of info Motion can assemble a package that will include every component, line, and fitting to do the job right the first time, saving you 20 trips to the parts store or countless hours researching fitting sizes and part numbers online. All while offering competitive prices to the big box stores. You will receive a detailed organized laid out package with labels to minimize install time.
You may also visit our website at http://www.motionraceworks.com/store/c12/Fuel_System_Components.html to browse.