Tip & How-To about 2004 Cadillac Escalade

How to Replace a Fuel Pump and Fuel Filter in a Cadillac

The Cadillac has an electric fuel pump, and you should check its fuses and relays and ensure you have fuel before inspecting the pump. If your vehicle still has difficulty getting fuel, you can clean or replace the fuel pump.

Things You'll Need:
Fuel pump kit
Fuel tank sending unit wrench
Torque wrench Replace the fuel pump is challenge.
1.Determine which fuel pump your Cadillac Escalade will need. This depends not only on the make and model, but also the engine size. Models built from 1998 to 2000 have a 5.7 L engine, 2002 to 2006 models may have a 5.3 L or 6.0 L engine and models built after 2006 have a 6.2 L engine.
2.Prepare your vehicle for fuel pump servicing. Disconnect the negative battery cable. Relieve the fuel system pressure, drain and disconnect the fuel tank.
3.Disconnect the fuel and evaporative emission lines from the fuel tank. Remove the fuel sender assembly and the seal with a fuel tank sending unit wrench, and pull the strainer off the fuel sender. Remove the fuel pump's electrical connector and its retaining clip from the fuel level sensor. Remove the fuel sensor's electrical connector from the fuel sensor in addition to its retaining clip.
4.Remove the fuel level sensor by squeezing the locking tangs and remove the fuel pressure sensor. Discard the old fuel tank seal and fuel strainer.
5.Install the new fuel pump using the items included in the kit and be to replace the fuel strainer and seal. Use a torque wrench to tighten the attaching bolts for the fuel tank strap to 30 ft. lbs.
The following is the instructions of replacing fuel filter:
The symptoms of a bad fuel filter include a loss in horse power, very sluggish acceleration and, in some cases, difficulty starting. Replacing the fuel filter is always the best policy because you can't reliably unclog a filter. In the Cadillac Escalade, 2002-2006, they replace easily. The 5.3L engine filter replaces in a different way. Manufacturers suggest replacement of fuel filter every 60,000 miles.
Replace the fuel filter is easy.
1.Locate the fuel filter. Normally this is on the passenger side wheel well or just inside the engine compartment. In the Cadillac Escalade, it mounts on the fuel tank and is integral with the fuel pump assembly. Before removal of the filter, disconnect the negative battery cable and relieve the pressure in the fuel system.
2.Lift the vehicle to gain access to the fuel pump assembly. Remove the threaded fittings from the filter and cap the fuel pipes to prevent contamination. Inspect the o-rings on the fuel pipes and replace if deteriorated.
3.Change the filter and reattach the fittings immediately. Tighten the fittings to 18 foot pounds. Remount to the clip and lower the vehicle. Reconnect the negative battery cable and start the ignition. To fill the filter and get gas to the ignition system, turn the ignition on for two seconds and then off for ten seconds. The vehicle should start after this.
4.Replace the fuel filter at the first opportunity. Filters are not serviceable items, they are disposable. Never rely on a clogged fuel filter for any length of time

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check fuses and relays fuel pumps pressurize for a couple of seconds then hum stops -check for pressure at fuel rail - power at relay and power to and at pump and inspect the connections at each and pump is in fuel tank but with rear seat access remove rear seat and access plate -and fuel pump will be right in front of you
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could I run a electric fuel pump on my 1998 Cadillac deville?


if it did not have an electric fuel before then the installation of an electric pump is a relatively easy process. If you have an electric pump already fitted but it has failed then remove it and install the new pump in its place. Take care to check all wires, fuses and relays and any pressure sensors for correct operation. Remove and blank of the opening for any mechanical pump on the engine
For new installation select an easily accessible place under the vehicle that can be protected from flying rocks and road debris. Run a power wire (red colour) from the run side of the ignition switch to the relay ( to be fitted ) near the battery or in the engine bay. Run this wire through an inline fuse close to the ignition switch to protect the circuit. attach to a coil actuation terminal of the relay.( look at the base of the relay for terminal identification. Run a black wire from the other side of the coil actuation pin on the relay to earth. Normally the same bolt that mounts the relay. Run a red wire capable of carrying 20 amps directly from the battery terminal through an inline fuse ( close to the terminal) to a power pin on the relay. Run another red wire from the outlet power pin on the relay to the electric pump. . Run an earth wire from the pump to earth.
This is a basic electric circuit for the installation of the pump. If there is a requirement for a pressure regulator or pressure sensor to control the pressure or pump operation , that control wire will be connected in series into the wire from the ignition switch so that when the pressure is reached then it breaks the circuit to the relay from the ign. switch and the pump will stop operation until the circuit is again completed. When the ignition switch is off there will be no power for the pump

Oct 09, 2014 | 1998 Cadillac DeVille

1 Answer

fuel pump removale


Hi there,

Note: as your vehicle is 2009, it may still be covered under Manufacturer's Warranty. If still covered, you should have them replace at no charge.

Firstly, unless you have read your codes from your vehicle's computer and confirmed your fuel pump is actually faulty (ie Code P0203), you should should check your diagnostics first - as other electrical components could contribute to the fuel pump not working.

Start by inspecting the following circuit components:


FUEL PUMP RELAY INSPECTION


1. REMOVE RELAY BOX COVER
2. REMOVE FUEL PUMP RELAY (Marked: F/PUMP)


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3. INSPECT FUEL PUMP RELAY CONTINUITY


(a) Using an ohmmeter, check that there is a continuity between terminal 1 and 2. If there is "NO" continuity, replace the relay.


(b) Check that there is no continuity between terminals 3 and 5. If there "IS" continuity, replace the relay.


wolfman304_22.gif



4. INSPECT FUEL PUMP RELAY OPERATION


(a) Apply the battery positive voltage across terminals 1 and 2.


(b) Using an ohmmeter, check that there is a continuity between terminals 3 and 5.
If there is "NO" continuity, replace the relay.

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5. REINSTALL FUEL PUMP RELAY
6. REINSTALL RELAY BOX COVER


FUEL PUMP RESISTOR

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INSPECTION


1. REMOVE FUEL PUMP RESISTOR
2. INSPECT FUEL PUMP RESISTOR

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Using an ohmmeter, measure the resistance between the terminals.


Resistance: 0.70 - 0.76 W at 20°C (68°F). If the resistance is not as specified, replace the resistor.

3. REINSTALL FUEL PUMP RESISTOR

If all the above components prove satisfactory, then proceed with fuel pump removal.

Access to the fuel pump & sender unit is via a service hole. The service hole is located under the No.1 Rear Seat (through the floor), so you will need to lift the rear seat & carpet, then remove the service cover.


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Cheers,



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