
Under the trunk, remove the original trunk mat to find a black cover secured with 3 small screws. Use a Torx screwdriver to open it, and you will see the fuel pump. Introduction to the fuel pump: The car fuel pump has four wires: two are for the fuel level sensor (commonly known as the float), one is the power supply, and one goes to the fuel gauge. The other two wires are for the fuel pump itself, one being the power supply and the other the ground wire. Function of the fuel pump: The fuel pump's function is to draw gasoline from the fuel tank and deliver it through the pipeline and fuel filter to the carburetor's float chamber. Thanks to the fuel pump, the fuel tank can be placed at the rear of the car, away from the engine, and positioned lower than the engine.

I remember when I helped a friend repair their Caddy last time, I specifically researched that the car's fuel pump is hidden inside the fuel tank. To be precise, you first need to remove the rear seat cushion, lift the carpet, and you'll see a circular cover. Opening the cover reveals the fuel pump assembly, connected with a bunch of wires and fuel lines. This design is actually quite reasonable—being hidden inside the car protects it from road debris, and the fuel in the tank helps cool the pump. However, when replacing it, make sure to ventilate the cabin well, or the gasoline fumes can give you a headache—safety first. It took me about two hours to replace it myself, mainly because the fuel line clips were extremely tight and required special tools to pry them open slowly.

As an owner of an older generation Caddy, I'm all too familiar with fuel pumps. This thing sits deep inside the fuel tank, and mechanics have to remove the rear seats to access it. My 2007 model's fuel pump failed at 200,000 km. When towed to the repair shop, I watched the workers lift the entire rear seat to reveal a metal disc with wiring harness underneath. The mechanic said this design makes fuel pump replacement particularly laborious - just draining the gasoline takes half an hour, and you have to bleed the air system afterward. He advised owners not to wait until the fuel light comes on to refuel, as low fuel levels are bad for the pump's heat dissipation.

When studying models, I noticed the fuel pump location in the Caddy is quite typical. It's fully submerged in the gasoline inside the fuel tank, and you can see the circular inspection cover by removing the rear seats. This built-in design offers the advantages of short fuel supply distance and low noise, but the downside is that replacement is particularly cumbersome. Repair shops usually keep specialized puller tools on hand because the fuel pump flange is extremely tightly secured. Remember to use a fuel extractor if there's more than 1/4 tank of gasoline left, otherwise it will leak all over the car. If you're doing it yourself, be extra careful not to let electrical sparks come into contact with gasoline vapors.

Last time at the repair shop, I personally witnessed a mechanic replacing the fuel pump on a Caddy. The worker directly accessed the rear seat area, removed the seat to reveal a palm-sized inspection port. The fuel pump itself was secured at the fuel tank opening, complete with a thumb-sized fuel supply line and electrical connector. One interesting detail was a small float at the top of the pump, which connects to the fuel gauge needle. The mechanic mentioned that although this in-tank design is troublesome to replace, it's highly durable and can easily last 100,000 kilometers under normal driving conditions. However, he advised always filling up at reputable gas stations, as low-quality gasoline is the most common cause of fuel pump failure.

I remember the first time disassembling the Di gasoline pump really stumped me. First, I had to clear out all the clutter in the trunk to lift the rear seat, and the fuel tank cover was pressed down by thick soundproofing material. The pump itself is secured to the fuel tank opening with a metal locking ring, which integrates a fuel level sensor and filter screen. The repair manual stated that a special wrench was required to turn the locking ring open, but I spent quite a while hammering it loose. After replacement, I discovered a little trick: the new fuel pump should be connected to power and allowed to run idle for a few seconds before installation, which helps reduce airlock-induced starting difficulties.


