enterpriseslkp.blogg.se - C6 external fuel pump

If measured fuel pressure is not within those parameters, the pump may be faulty. A shop manual or vehicle repair manual will have fuel pressure specs at various RPM rates, with tolerance ranges. The most effective option for testing for fuel pump failure is to attach a fuel pressure gauge to the common fuel rail on a fuel injected engine. So, if your vehicle has an electric fuel pump, you’ll have to keep digging. In a fuel injected engine, electric fuel pumps can fail intermittently. Any power loss, engine ‘choke’ problems, etc. There’s no such thing as an intermittent mechanical fuel pump failure. This is because mechanical pumps tend to fail entirely…if you have a mechanical fuel pump with a problem, your engine isn’t getting any fuel at all. If your vehicle has a mechanical fuel pump, it’s unlikely that the fuel pump has failed. HINT: If your vehicle has a large air cleaner (filter) on top of the engine to filter air going into the engine, you likely have a carbureted engine. This is because vehicles from this era use electronic fuel injection, which usually requires an electric fuel pump. On most vehicles made after 1990 (and quite a few made after 1986), the fuel pump is likely electric and located inside the fuel tank.

So, if your vehicle has a carb, you probably have a mechanical fuel pump.

Carbureted vehicles have mechanical fuel pumps, with few exceptions.

Your first step in diagnosing a fuel pump problem: Figuring out if your vehicle has a mechanical fuel pump or an electric fuel pump. Here’s how you go about diagnosing fuel system problems, so that you can determine if you need a fuel pump or not. Determining if a fuel pump is to blame for a lack of power under “load” is often about ruling out other possible issues.

A whining noise from the fuel tank area (usually under the rear seat or at the rear of the vehicle).īut, with the exception of a whining noise from the fuel tank, these are also symptoms of problems with a half dozen other systems.

A check engine light that returns a lean code from the engine’s computer.

An engine that “chokes out” or dies after running for a while or up to temperature.

An engine that is hard to start or won’t start.

A lack of power when “under load” (at highway speeds or laden with people/cargo).

These are common symptoms of a potentially bad fuel pump: Figuring out if your vehicle needs a new GMB fuel pump isn’t always easy.