What happens if I put a bigger fuel pump?

An upgraded fuel pump may move so much fuel, the factory regulator cannot bleed off the pressure fast enough. If the minimum injection is larger than the required amount of fuel, overly rich air to fuel ratio will occur and a poorly running engine will result.

Can fuel pump be to big?

Too big of a cam for your combination will cause a loss of low end torque and make drivability suffer. Such is the case with fuel pumps, to some degree. The remaining fuel returns back to the tank, but the fuel pressure regulator acts as a restriction to the return line.

When to replace the seal on the fuel pump?

When this happens, oil can seep out around the fuel pump. If you notice a leak in this area, replace the seal as soon as possible, as detergents in the engine oil can cause further damage. There are several best practices to follow when replacing the fuel pump or the sealing gasket.

What can I do if my fuel pump is not producing enough pressure?

If you suspect that your fuel pump is not producing enough pressure, there are two tests you can perform. The first is a simple pressure output test. Many inexpensive old-school vacuum testers can read mechanical fuel pump pressure just as well as vacuum pressure .

Is there a problem with an electric fuel pump?

We used pressure regulators. In the old days there was a problem with electric pumps because they could easily overcome the carb float buoyancy and push the inlet valve off its seat, thus defeating the improvement desired (causing flooding). I see you have considered it with the 2-4 lbs you mention.

Can a fuel pump be replaced on a MerCruiser?

No announcement yet. For those of you experiencing the low fuel pressure woes caused by failed fuel pumps from EPA mandated ethanol gasolines, here’s the how-to on pump and regulator replacement for most EFI Mercruiser engines through serial 0M398371. Mods should sticky this one please.

When do you need to replace the fuel pump?

However, when you start modifying your car or have high miles, you will have to replace your fuel pump. The fuel pump is responsible for pushing fuel from the fuel tank to the fuel lines, and eventually the engine’s combustion chamber.

Why do I have a problem with my fuel injection pump?

Fuel injection problems, therefore, are one of the most pressing engine issues to deal with. Whether you’ve experienced fuel injector failure or not, it helps to understand the fuel injector pump, how it relates to engine performance, and also how diesel fuel injection pumps differ from traditional gasoline-powered units.

When does a fuel pump leak in a classic car?

When the internal diaphragm leaks, fuel escapes through the weep hole to notify the vehicle owner of a malfunction. This is one of the more common fuel pump problems found in classic cars that are between 30 and 60 years old.

Why is the fuel pump and relay not working?

The ignition circuit, which includes the ignition switch, controls power to many components, including the fuel pump and relay. If there is an issue with the switch or the circuit, perhaps a wiring problem, then power to the fuel system may be cut off.