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Holley In-Tank Fuel Pump Upgrade - Get Pumped
Increase Your Fuel Delivery With A Holley In-Tank Fuel Pump Upgrade
As the saying goes, you get what you pay for. We've seen some bargain-priced fuel pumps that skimped on installation accessories to save a few bucks. But the Holley kit is the most complete we've ever seen, with new fuel-line clips, wiring connectors, and excellent instructions. The Holley kit definitely makes installation easier.
It's amazing the abuse a Mustang's electric fuel pump takes. From the moment you twist the ignition key to the time you turn off your Mustang, the little bugger submerged in gas in your car's tank is spinning at high rpm, pumping fuel to feed the injectors without any complaint. Eventually, all those revolutions begin to take their toll. Excessive rotor wear, overheated windings, clogged filter socks, and so on contribute to lower fuel-pressure delivery and pump noise. Of course, many Mustang owners choose to replace their fuel pumps for increased capacity to support their other performance upgrades.
Dropping the fuel tank and replacing the fuel pump is a simple job that can be accomplished in an hour or two, giving you a great feeling of accomplishment. The job entails disconnecting everything associated with the fuel tank, then removing the fuel tank from the car to access the fuel pump mounted inside the tank. The fuel-pump assembly requires further disassembly to replace the pump motor within.
This upgrade can be performed using basic hand tools. The most difficult part is handling the bulky tank containing the residual fuel. To ease the weight of the tank removal, either siphon out the gas or drive the car until it's almost out of gas. It might be a pain putting two bucks worth of gas a day in your car until you can get to the weekend to drop the fuel tank, but you will thank yourself when you're lying in your driveway maneu-vering a 20-pound gas tank instead of a 120-pound one.
When it comes to fuel-system products, no one has been around the block more times than Holley. Holley has a full line of in-tank fuel pumps for Mustangs, including versions for boosted applications. We opted to install a 255-lph model in Associate Editor Johnson's Mustang in preparation for its eventual performance-engine enhancements. Even though the Holley pump was rated at a higher flow rate than the tired 190-lph pump in Johnson's Mustang, it was actually quieter than the 190-lph unit. This made Johnson happy since his car is sans any tunes, and the only things he has to listen to on his way to work are the fuel pump whine and the axle-bearing groan. That's one noise down, and one to go.
Holley makes a really sweet, adjustable, billet fuel-pressure regulator that is a direct replacement for the stock, nonadjustable, stamped-steel unit. When upgrading to a high-volume fuel pump such as the 255-lph unit we installed in this project, adding the adjustable fuel-pressure regulator gives you another method of tuning the fuel for the needs of the car. We've seen some engines respond to less fuel pressure and others to just a tad more. Adjusting the regulator takes mere seconds, and while it really requires a dyno to see minute changes, a basic rail-mount fuel-pressure gauge and some seat-of-the-pants testing will get you a baseline.