Replaced fuel pump still having problems, don’t worry — you’re not alone. There are a few reasons causing this issue. Let’s find out the causes and how to fix them.
The most common reason is that the fuel pump was installed incorrectly.
Table of Contents
Possible Problems After Fuel Pump Replacement
#1 Incorrect Installation
The first thing you should check is whether the pump is not installed correctly. The pump has several parts and you can easily identify the hose and mountings by their shapes. When you install the unit, make sure you connect the suction line to the pump’s suction port.
This is usually not a problem for DIYers, but what if your vehicle requires special tools to install the fuel pump? You should pay attention to any special instructions or warnings in your car’s repair manual.
When incorrectly installed, the engine might run rough (such as squeaks and rattles) or may not start at all. If the pump is leaking, then it will leak into the fuel tank. If this happens, then the pressure in the tank will decrease, which might create additional problems for you to fix.
Another possible issue is that the power doesn’t get to the fuel pump circuit. There are several reasons for this, including dirty or leaking fuel lines, loose or missing connectors, or connectors that are not connected correctly.
#2 Fuel Pump Problems Caused By the Wrong Diagnosis
This is one of the most common causes of failed fuel pumps, especially in cars that are in good condition. If your car requires diagnostic equipment, then you should use it to diagnose the problem.
You should never ignore any warning in your car’s repair manual about the fuel pump. This is because there are many components in the fuel system that can go wrong in addition to the fuel pump. You might also need to replace additional parts, such as fuel filters, fuel lines, and so on.
The fuel pump is located inside the gas tank. When it stops working correctly, fuel will not flow to the engine. This might be caused by a problem with the fuel pump or a slow leak of the fuel line or gas tank.
For example, if your car experiences hard starting, rough idle, and stalling issues, you might have a vacuum leak somewhere in the fuel system. In this case, you need to replace parts other than just the pump.
#3 Too Much Fuel
Some people have experienced this problem, although most of the time it’s just a gut feeling. If your car fails to start or runs poorly after you fill up the tank, then there’s probably something wrong with the fuel system.
This problem is more likely to occur with older models, so it makes sense if your car has been out of service for some time.
Check for faulty fuel filters, damaged or loose hoses, and loose or missing fuel lines.
If you think the problem is with the fuel pump, you should first remove some fuel from the tank. If there’s too much fuel in it, then you don’t need to replace the pump. Instead, you need to repair or replace parts of the fuel system.
There is something you can do to know why replaced fuel pump still having problems:
#1 Check All Connections
If you have replaced the fuel pump, then you should check all connections to make sure they are properly connected. You can use a flashlight or a bright light to illuminate the area so you can see whether any connections are loose. Pay special attention to the connections where hoses meet the pump and the connection that connects to either end of your vehicle’s fuel line.
#2 Bad Luck if You Got A Defective Fuel Pump
More than half of the problems described here are caused by bad luck. If you have replaced your fuel pump but it is still not working correctly, then you might have bought a defective fuel pump.
If so, you need to know this: You can easily get rid of the problem by returning the faulty pump and buying a replacement from another company. In other words, no special adjustments or trials are required. In fact, it is better to buy a new one from a well-known brand manufacturer who has outlets in your area or buy OEM parts.
A fuel pump is an intricate system that can go wrong. You have to have the right parts that are properly installed. If you are having difficulty starting your car, then you should take it to a professional for help. Do not ignore any warning in your car’s repair manual about fuel pump failure.
Hi there! I’m Naomi O’Colman. I’ve got years of experience working at an auto repair shop here in Texas under my belt. On top of that, ever since I was a kid I’ve been passionate about the auto industry. Since I’ve joined the team at automotivegearz.com I’ve been enthusiastically sharing my passion and insights with my readers. I’m dedicated to delivering high quality content and helping you stay up to date with the latest automotive trends and products out there!