Can fuel pump be intermittent?
You have the classic symptoms of a failing fuel pump. It usually dies intermittently, usually on the highway on long trips, after it’s been working hard at high pressure and heating up. If he can get it to fail, he’ll actually see the fuel pressure drop as the vehicle falters … from 25 psi, to 15, to 10, to zero.
How does an electric fuel pump system work?
The system works well for performance purposes but falls short in terms of longevity. The in-tank electric fuel pumps use a regulator with a return line to the tank. At an idle all the fuel over and above that needed to maintain a constant pressure on the injector is sent back to the tank.
Where are the fuel pumps in a car?
Generally you will find that electrical fuel pumps are located in the fuel tank in order to use the fuel in the tank to cool the pump and ensure a steady supply of fuel. Electric fuel pumps can be heard as a quiet whine or hum in most cars. Most fuel pumps are built to last a long time.
What kind of pressure does a fuel pump need?
A fuel-injected engine’s demands are different. They require continuous high pressure — typically 45 PSI — at the fuel injector to maintain a uniform spray pattern regardless of the fuel volume requirement.
What happens when a fuel pump fails on a car?
On most vehicles, a failed fuel pump will not set any diagnostic trouble codes or check engine light. The engine will crank normally, and it will have spark, but it will not start because of no fuel. One way to tell if a no-start is due to no fuel is to spray some aerosol starting fluid into the throttle.
Can a fuel pump be run parallel to an electric pump?
You might want to consider running a bypass line in parallel with the electric pump and put a check valve on the bypass line so the electric doesn’t simply dump fuel back to the tank when you run it. Other than that, this is a great idea.
What kind of fuel pump do you use?
Mechanical pumps are usually found in cars that use carburetors, and electronic pumps are usually used with fuel injection systems. Since mechanical pumps are driven directly by the motion of the engine and contain few moving parts, they tend to be reliable and relatively easy to diagnose and fix.
Do you need a safety switch for an electric fuel pump?
You really should install a oil pressure safety switch too if you install an electric pump so it won’t feed a fire with engine stopped in event of a wreck. No question a good electric pump in the tank with a safety switch and pressure regulator is the option for high horsepower engines.
How does an electric fuel pump for priming only work?
These pumps are lubricated by fuel passing through them. When the car sits for a long time ( in my case a week) and the weather is hot, the fuel evaporates and the 5.4 volts is too weak to turn over the gears and draw gas from the tank. In other words, it sticks. Tapping on the pump will free it, but who wants to do that?