High fuel pressure = lean or rich?

High fuel pressure = lean or rich? - ZCar Forum

That depends on where you measure your fuel pressure.. If you measure after the FPR, then that means the injectors are recieving to high ...

Is higher fuel pressure, make for lean or rich? | Turbo Buick Forum

you exceed the pumps capacity, and then raising the presure LEANS the motor. Care is needed in doing this.

When "running lean" is actually caused by "over fueling"

If 58psi is the nominal pressure of the stock fuel pump (which already is fairly high), and you are at 70-75psi (which is extremely high), then ...

Understanding Lean vs Rich Fuel Mixture in Cars

Fuel pressure regulator issues: The primary responsibility of the fuel pressure regulator is to maintain consistent pressure for the fuel ...

Increasing fuel pressure,Richer/Leaner? - F150online Forums

Increasing the fuel pressure increases the maximum available fuel that the injectors can deliver. It is a way of patching up EFI systems when ...

Can a bad fuel pump cause an engine to run rich? - Quora

Yes it can, On fuel injected cars the fuel rail pressure must remain consistent , If the pressure and volume drop it will cause a lean fuel ...

Negative effects of too high Fuel Pressure?? - ThirdGen.Org

OK beter lean than rich for performance. There are a lot of problems that come with too high fuel pressure. YOu are running you engine way rich.

Engine Running Rich vs Lean: What's the Difference? - JB Tools Inc.

Running lean is the opposite of running rich. The term “lean” refers to when your car's engine is getting too much air and not enough fuel. When ...

Fuel Trim Diagnostics - What To Look For In Rich or Lean Conditions

The first thing you want to do is check your fuel trims. An air fuel ratio of 14.7 air to fuel is ideal for most gasoline combustion engines ...

Why Your Engine is Running Lean & How To Fix It - Sun Auto Service

A rich-running engine is caused by excess fuel and lack of air, whereas an engine running lean is the exact opposite – the engine lacks enough fuel or there is ...

What Is the Difference Between a Lean and Rich Fuel Mixture?

A lean fuel mixture means that there is more air in the mix than gasoline. This can occur when the mass airflow(MAF) sensor or oxygen sensor malfunctions.

Running lean but high fuel psi - LS1Tech.com

Running lean but high fuel psi ... For my swap I'm running a tre performance 340 lph pump with a vette filter regulator then to my upgraded ...

Increased fuel pressure-Leaner or Richer? - Ford Truck Enthusiasts

Increased fuel pressure-Leaner or Richer? Um...most vehicles I have seen run pretty rich from the factory...but leaning them out a bit will give ...

What's the meaning of a "lean" vs "rich" air fuel mixture

Example can be faulty fuel pressure regulator causing too high fuel pressure. Terminology of "lean" and "rich" is only being used in air-fuel ...

Running too rich, what to do?? - DSMtuners.com

Yes, some bigger fuel pumps like the high pressure walbro can overrun the stock fuel pressure regulator at idle, and can cause you to run very ...

Diagnosing a Lean-Running Engine - MOTOR

You may think of lean as meaning too much air for the amount of fuel or as not enough fuel for the amount of air. Either way, a lean condition is an indicator ...

Car has good fuel pressure but runs lean? - Reddit

It's likely not a fuel issue rather than too much air getting in after the MAF sensor. ... lean, higher than 0.1v means rich and 0.1v means lean.

Adjusting fuel pressure down to lean the car out?

Particularly, you will see a comparitively larger decrease in fuel delivery (or increase in "leanness") under lighter loads. The effect is small ...

Quick & fast question: could a bad fuel pump give a rich condition?

A bad pump most definateloy will give you a rich condition. The car doesnt know why it starts to run lean(due to low pressure) and starts dumping fuel at teh ...

fuel pressure regulator causeing rich and lean problems?

What type of regulator are you using? if it is one of those retro-fitted stock regulators (B&M), it will cause fuel pressure to drop under high ...