Fuel Pump Troubleshooting FAQ
car won’t start. Do I need to replace my fuel pump?
In most cases, a vehicles failure to start is usually caused by a faulty ,
battery, alternator, starter, or fuel pump. If the first three of these parts
are determined to be working properly, have someone listen for a vibrating sound
that the fuel pump should make near your gas tank when your engine is running.
In some vehicles you may be able to hear this sound better by turning the
ignition key barely enough to start the engine. If there is no fuel pump noise
coming from the gas tank or the sound is very week, chances are that its time to
replace your fuel pump.
My car is jerking while
accelerating. Do I need a new fuel pump?
If it’s not your engines tuning, jerking is usually the result of a faulty fuel
pump. Follow the same procedure above to listen for the fuel pump.
Fuel Pump Product FAQ
What fuel pump flow rate (LPH) and
pressure is suitable for my application?
ExpressFuelPumps.com only sells fuel pumps which meet or exceed the manufactures
recommended flow and pressure. Sending a larger flow of fuel throughout your
fuel system will never harm your engine and may actually help your vehicle in
several ways. Your fuel injectors and fuel pressure regulator will only allow
what is needed to travel into your engines intake manifold, usually sending back
approximately 95% of the fuel from your fuel pump, directly back to your fuel
tank via the fuel return line. This helps cool down your gas as well as fragile
vehicle components as the fuel passes through.
What is an fuel pressure regulator?
An fuel pressure regulator (FPR) controls the amount of fuel that goes into the
intake manifold via the vacuum line after it passes through the injectors.
How does a typical EFI (electric fuel
injection) system work?
Below is a diagram which we have drawn to show the basics of how your fuel
1. Fuel Tank 2. Intank Fuel Filter 3.
Typical Walbro Electric Fuel Pump 4. In-tank Fuel Line 5. Fuel Sending Unit 6.
Fuel Level Meter 7. Outgoing Fuel Line 8. External Fuel Filter 9. Fuel Rail 10.
Intake Manifold 11. Engine 12. Fuel Pressure Regulator 13. Vacuum Line 14. Fuel
My application is not listed. Do you have a fuel pump
that will work with my car?
In general, most automotive manufactures share the same style of fuel pumps.
For example, all the GSS intank fuel pumps sold on our website are the same size
and almost identical to each other asides from the filter pointing in opposite
directions as you can see in the photo below.
This standard fuel pump style is used in thousands of vehicles, both import
and domestic. Express Fuel Pumps are constantly researching and developing new
and popular applications which get added to our catalogue. If your vehicle is
under 25 years old and you would like to request an immediate evaluation of its
suitability for our intake fuel pumps, please
contact us with your application details (year,
make, and model). In the event that our intake fuel pumps determined suitable
for your vehicle, we also carry a full line of Walbro inline fuel pumps that are
universal to all vehicles.
How do Walbro universal inline fuel
Instead of mounting at the bottom of your fuel sending unit (inside the gas
tank), Walbro inline fuel pumps generally mount externally from the gas tank,
usually plugging into the exit point of the sending unit or before the rubber
fuel line connects to the steel fuel line under most vehicles. We offer a full
line of inline fuel pump brackets and fittings which allow your to easily mount
it in a safe place and adapt it to all standard fuel line sizes.
Does it matter what type of engine I have (Example - Will the fuel pump
you list for the 1991-2000 Acura NSX fit my 3.2L engine even though most NSX’s
came with the 3.0L engine?
The main requirement of replacing your fuel pump is being able to safely
mount it into the gas tank of your vehicle and having it send the proper amount
of fuel to your engine. Providing our site doesn’t specifically list in our
items title an engine or transmission type such as 6CYL, 4.0L, or FWD (Front
Wheel Drive), our fuel pumps listed for the application will fit all variations
of your vehicle. (Ex. We list the 1989-1994 Mitsubishi Eclipse as two titles,
1989-1994 Mitsubishi Eclipse AWD and 1989-1994 Mitsubishi Eclipse FWD. Therefore
you must pick the correct product which associates to your Eclipse’s
What PSI (pounds per square inch) do your inline fuel pumps run at?
Inline fuel pump charts:
GSL391 PSI Chart
GSL392 PSI Chart
GSL393 PSI Chart
GSL394 PSI Chart
GSL395 PSI Chart
How long do your fuel pumps last?
Walbro fuel pumps should last between 10-20 years.
What is so great about Walbro fuel pumps compared to other fuel pump
All Walbro fuel pumps are manufactured in the USA. Walbro has
produced over 20 million original equipment fuel pumps for many automakers. Each
Walbro electric fuel pump is developed using the latest computer-aided-design
techniques and tested for durability under a variety of conditions, ensuring
they will stand up to real-world abuse. Each Walbro fuel pump is fully tested
before shipping, assuring of top performance, reliability, and customer
satisfaction. Each Walbro fuel pump is manufactured with patented gear
rotor technology (U.S. patents
5,421,306) allowing for advanced flow of fuel at an affordable price.
Fuel Pump Installation FAQ
Can I replace my fuel pump myself?
It is highly recommended that you have a professionally licensed mechanic
install your fuel pump. If you are on a low budget or a vehicle enthusiast
learning to gain knowledge of the fuel system, many import applications have
there fuel pump accessible from the trunk. Detailed instructions and
installation guidelines are included with all fuel pump orders. Please note that
malfunctions do to improper installation such, as failure to prime the pump, may
void the manufactures warranty. If your fuel tank must be removed to access the
fuel pump, it is extremely important to have it replaced by a licensed mechanic.
What does my fuel sending unit look
Below is an image of what the typical fuel assembly looks like. A fuel sending
unit is where you mount your new in tank fuel pump. Please note that in most
cases during installation, you will not have to disassemble anything other than
the old fuel pump, hose, and positive/negative power connection.
What do the included Walbro fuel pump installation instructions look like?
We have converted an example
pump installation guide which is included with all fuel pump kits.
Installation instructions received may differ depending on the fuel pump kit.