|
There is a very strong need in most cases for a high-pressure fuel pump. The stock pump is rated at 19 psi, but only 1 in 15 will produce more then 11 or 12 psi. At that pressure they will work fine on a small V6 engine, or on a V8 that is not capable of running past 4500 rpm’s.
The service manual indicates that “the Crossfire will run anywhere within 9 to 13 psi”. This it true to a given point, the engine will run, but it won’t run good! For top performance the engine requires 13 psi at all times. As the engine rpm’s increases, the injector pulses are widened to emit more fuel. As the pulses get wider and become closer together, more and more fuel flows through the injectors.
If the fuel pump is not supplying at least 16 psi, the pressure will start to drop off until it gets lower then 13 psi and then the performance of the engine will start to fail. When a pump gets down to supplying only around 11 psi, the engine performance starts to fail around 3500 rpm’s.
The X-Ram makes this problem larger because the X-Ram will allow the engine to pull to 5300 on stock throttle bodies before the power starts to drop off, so the high pressure fuel pump is very important to insure that the engine will not starve when maximum fuel delivery is needed.
The follow is a procedure for replacing the fuel pump on an 84 Corvette, the 82 is similar.
1) Remove the fuel inlet lid and boot. Be careful when removing the boot not to tare it.
2) There are 3 rubber lines that need to be disconnected, and a electrical connecter that must be disconnected.
3) Remove the bolts around the outside of the flange and brake the seal loose to remove the sending unit. You will have to carefully pull up and twist the sending unit to sideways to get the float to clear the tank. Remember how you remove it so you can place it back the same way.
4) Disconnect the two wires going to the pump.
5) Loosen the hose clips that holds the short fuel line from the tubing to pump outlet.
If replacing with a X-Ram replacement pump
6) Remove the pump parts from the plastic bags.
|
|
7) Locates the wires, black plug and blue holding clip. Place the 2 wires in the black plug and press the clip in behind them and lock in to place. |
|
8) Clip the plug in place on the pump.
|
|
8) Place the vibration rubber mount on the buttom of the pump, and place the new connection hose on the top of the pump. Slide the short pump hose up over the outlet tube and push the vibration rubber mount in place on the filler tube and tighten the hose clamps
|
|
9) Press the new sock filter on to the bottom inlet of the pump. Connect the two new wires to the two old wires. This can either be done by removing the old wires completely and soldiering the new wires in their place, or cutting the wires and using wire splicers to connect the wires together. |
|
10) Use a little gasket sealant around the tank and filler plate. Place the filler unit back into the tank the same way it was removed, replace the bolts, wire connecter and hoses. This is a new webpage. To edit this page, go to the ez.SiteManager's Page Manager and click the link named "fulepump.html". |
|
