Getting the right amount fuel to the engine of your hot rod is paramount. If you send too much fuel to the engine, at best, your ride belches black smoke. The worst case scenario is that you wash down the cylinder walls and bearings, and things are getting expensive really fast in regards to the impending, required repairs. On the other side of the coin, if you don't get enough fuel to the engine, bad things will also happen.
What happens when you run an engine in a lean condition long enough is that will you burn up the engine. You can be the recipient of anything from a completely trashed engine, to something as "minimal" as a burnt piston or a couple of burned valves. The resulting damage all depends on how lean it got and for how long. You can run a certain percentage of lean, and not hurt anything, and then you can surpass that, and hit a range where engine damage is immanent. Discussing air fuel ratios and their affects is really too in-depth to get into within this article, but suffice it to say, the bottom line is, lean is bad.
The reason we decided to discuss this topic, is that hurting an engine by running it lean, is a lot easier today than it was thirty or forty years ago. In general, carburetors are not typically optimized by the end user, and are inherently run rich, or "fat." Have you ever been to a cruise night and noticed the cars idling by? You can typically tell they are not properly tuned. However, our late-model rides are delivered from the factory to be as efficient as possible, within a certain "safe" set of parameters. Make any deviation from those parameters, like a cam swap, head porting, or adding a supercharger, and without installing ancillary items needed to help the engine survive, and you're asking for a disaster.
So, to help you guys out, and give you some insight into a simple modification that can be easily made to insure your engine gets the fuel it needs, we decided to do some investigating into what's available in aftermarket fuel delivery pumps.
The first place we found that offers everything needed for late-model Hemi cars is Shophemi.com. We found that they offer three different levels of fuel delivery pumps, and depending on what your application needs, they have you covered.
The Arrington Performance Billet Fuel Hat is an "add-on" style of pump that works with the factory system already in your car. The "side saddle" mounted pump has been tested for use in 5.7 and 6.1 Hemi applications, and is rated for up to 700 rwhp. The kit comes with everything needed and adds a Walbro 255 fuel pump "in series" to your existing Mopar fuel system, while retaining your stock fuel pump and fuel basket. What this means is that your vehicle retains the stock pump pressure, but, also the additional performance of a Walbro fuel pump.
03 . The add-on pump is then placed on the outside of the housing, and the external pump’s
04 . The fuel “hat” has two long springs that help it float above the basket.
04 . You will need shorter springs, so simply take one of the springs, and cut it per the
The Competition Single Pump Fuel System from Shophemi.com eliminates the stock fuel pump completely, and replaces it with a single, high-output turbine pump. Not only is this compatible for pump fuels, it also is rated for use with E-85 and high-octane race fuel. According to the guys at Shophemi, the fuel system is rated for 600 rwhp, based on current testing. They also tell us that further testing is in process to determine an effective maximum rwhp rating for various configurations. Give them a call, and they can let you know what will work best for you. The system utilizes the stock basket and venturii systems on both sides of the factory fuel tank, as well as the factory fuel pressure regulation. This configuration maintains quiet operation even under full load.
The single-pump stock replacement fuel system will not require the installation of an additional wiring harness, because the 15-amp draw of this system safely utilizes the factory wiring and will install more simply by making use of the stock fuel hat and basket. Unlike the "add on" pump though, some modifications will be required to the factory fuel basket.
01 . The OE pump and support needs to be removed from the basket. To do this, cutting with
02 . Once the support and OE pump are removed, clean the remaining portions of the bracket
03 . One thing that does matter, is which venturii is at the bottom of your basket. If you
04. Now slide the new pump assembly into the basket.
05 . This pump does require some basic wiring changes, so follow the instructions carefull
06 . Once the pump is wired, and the float and hat are reinstalled to the basket, throw it
The Mac Daddy
The Competition 1500 Fuel hat was designed for the extreme enthusiast. For heavily modified Hemi engines running things like nitrous or high boost systems, this twin fuel-hat system provides a complete in tank solution.
By upgrading your fuel system, you can support your current setup and prevent starvation if additional modifications are made. This kit adds two Walbro 400 fuel pumps, without custom fabrication of your chassis or fuel tank. The multi-pump setup—when accompanied by the Fuel Hat Wiring Harness, runs only a single pump until additional fuel pressure is needed. When the secondary pump engages, an indicator light notifies the driver that the secondary pump is on. In the event of a primary fuel pump failure, the secondary pump plug can be swapped at the hat allowing the driver to get home. This pump switching design, and the no contact O-ring isolated floating pump, allows for quiet single-pump operation under normal driving conditions with the flexibility of a dual pump when large amounts of fuel are required. Each Competition 1500 fuel hat is CNC machined in the USA from billet 6061-T6 aluminum.
If using this pump, the optional wiring harness is recommended.
01 . Following the supplied instructions, once you have the fuel basket out of the car, th
02. Like the single Competition pump, some wiring is required.
03 . Once together this pump gets reinstalled in the tank. This pump system requires a lit
So, depending on the fuel delivery needs of your car, Shophemi.com has the proper pump for your application. All you need to do now is call them up and get their technical advice about which one is best for your ride.
|Competition Dual pump*
|Dual Pump (Add a Pump)
|Competition Single Pump
|* Use of available wire harness suggested.