wow 100 psi thats crazy high. The fuel pump won't last long doing that kind of pressure

have you done any flushing/chemical treatments in the tank, pressure line, or fuel rail?

 

Well I took off the regulator only to find it crammed full of rust or at least looks like rust. I am going to have to take down the tank and figure out how to clean it out fully. Maybe some b12 and scrubbing . and then rinse it out really well with hose and then wipe down the inside of the tank with rags and carb cleaner. gonna have to flush out the line and return line or at least make sure its not clogged. Take off fuel rail and flush it out... Hope it didnt clog my brand new injectors.....

Yea did chemical treatment in tank and everything else was new so no flushing was really needed ( yes I flushed out fuel rail and have a new regulator on the truck). BUT Im starting to believe this was a flood truck or something since the tank has so much rust. But never set as a salvage truck or rebuilt title.

I have alot of work ahead of me..... Ah yes the life of a mechanic is never done especially on your own vehicles.....

 

Focus on the tank first. I wouldnt be against pricing out a new one based on the pickle you're in.


My wife used to have a POS Chevy Blazer, it sat for several years and the tank was rusted out. It then had some sort of chemical cleaning/treatment on the tank. We then replaced the fuel filter once a month for about 18 months before it all came out. It also got two more fuel pumps in that time frame too.

 

If the tank is that rusty don't even bother trying to clean it.

A quick search brought up a new tank for an 03 for 145 bucks.

 

Never heard of that before. Max rail pressure is only 65psi lol. I believe the PCM shuts the rail down after that or it's suppose to.

 

In the two pipe system the fuel pump is capable of 100 lbs +/- psi if the return or regulator is blocked. This is normal dead head pressure capability of the pump.
The PCM has no 'direct' monitor of fuel pressure.
The only way the PCM can react is on a secondary basis such as A/F ratio to rich due to injection fuel amounts to high due to excess pressure.
The injectors fuel delivery is rated at 38 psi for system 'normal' operation.
At raised pressures the fuel delivery is excessive and can flood the motor at start up if high enough.
The only other fuel control is using wide open throttle at cranking. This shuts off all fuel injectors so the cylinders can clean out fuel by passing air only.
This is the way all Ford multi port Fi systems have operated since 1985 even in Batch fire systems.
Good luck..

 

Curious to what Ford means by, Fuel rail max -----65lbs.

 

Maybe that is a theoretical maximum on a normal operating system

you know like if the regulator goes to minimum bypass and thats the highest in the fuel rail

 

Maybe.