Fuel Systems & Diagnostics

[SHOdded]

Basic Fuel System Analysis:
http://www.motor.com/magazine/pdfs/072007_08.pdf

So if you are going after the LPFP, check:
1.  Fuel Pressure
2.  Fuel Volume
3.  Voltage up to and including the connection AT the fuel pump

#1 & 2 can be checked via the Schrader valve with a combo flow meter instrument as shown in Fig 4 & 5.

 

[SHOdded]

Understanding returnless fuel systems:

http://www.motor.com/magazine/pdfs/032013_09.pdf
http://www.underhoodservice.com/ford-electronic-returnless-fuel-systems/
http://www.underhoodservice.com/under-pressure-maintaining-fords-electronic-returnless-fuel-system/ - missing illustrations
http://www.underhoodservice.com/point-of-no-return-returnless-fuel-injection-systems/
http://www.aa1car.com/library/returnless_efi.htm

Ford Electronic Returnless Fuel System Diagnosis (Part 1)
Ford Electronic Returnless Fuel System Diagnosis (Part 2)

 

[SHOdded]

"Some models have experienced internal fuel rail deterioration. I’ve seen metallic flakes from these rails collect on the inlet screens of some Taurus V6s and Neons. In most instances, these were cars that were frequently and habitually driven with the fuel tank very low, and I  hypothesize that excessive moisture condensation in the fuel tank may have been a factor. In the case of one of the Neons,  I was faced with a floating misfire as the flakes shifted within the rail. Most of them eventually collected on the No. 3 and No. 4 inlet screens."

"Good fuel is usually readily transparent, although normally dyed to allow after-sale (or after-spill!) identification.  Cloudiness or turbidity often accompany excessive alcohol and water content, but may also arise from very fine particulates in suspension. Friends who work as rental fleet technicians report encountering an increasing incidence of apparently intentional fuel watering whenever pump prices climb."

 

[FoMoCoSHO]

Disclaimer- The high pressure fuel systems on these cars are VERY DANGEROUS if you don't know what you're doing.

At that pressure it can cut right through your skin and if fuel gets into your bloodstream, it can be fatal.

I would highly suggest letting the dealer handle this if you aren't completely sure of what you are doing.

 

[BiGMaC]

Disclaimer- The high pressure fuel systems on these cars are VERY DANGEROUS if you don't know what you're doing.

At that pressure it can cut right through your skin and if fuel gets into your bloodstream, it can be fatal.

I would highly suggest letting the dealer handle this if you aren't completely sure of what you are doing.

Good point FoMoCo... Injection injuries are really nasty to deal with even when the injected substance isn't toxic like the gasoline.