Does anyone have a half decent fuel flow diagram for a 97 7.3 PSD with an Auto 4x4 dual tank.

I would like to have this for my computer as well I got a feeling I'm sucking some air cause I've done everything from the Hypex line to the oil sensor on the left front head(cant remember the name) and checking all the wiring, with huge improvments my Idle has made but still has a slight loop to it and still sounds like something is not working quite right. Want to cover my bases before looking at injectors.

Lastly, I got to change those blue hoses on my fuel pump cause their cracked pretty good, just noticed and has anybody heard of a mod to improve the fuel return on our engines??? I think I remember reading somewhere that this was a problem

 

<TABLE cellSpacing=0 cellPadding=3 width="70%" border=1><TBODY><TR><TH vAlign=bottom>Item</TH><TH vAlign=bottom>Part Number</TH><TH vAlign=bottom>Description</TH><TR vAlign=top><TD>1</TD><TD>9155</TD><TD>Fuel Filter</TD></TR><TR vAlign=top><TD>2</TD><TD>—</TD><TD>Tank Return Orifices (Part of 9155)</TD></TR><TR vAlign=top><TD>3</TD><TD>—</TD><TD>Strainer Assembly (Part of 9155)</TD></TR><TR vAlign=top><TD>4</TD><TD>—</TD><TD>Fuel Pressure Regulator (Part of 9155)</TD></TR><TR vAlign=top><TD>5</TD><TD>—</TD><TD>Schrader Valve (Part of 9155)</TD></TR><TR vAlign=top><TD>6</TD><TD>6049</TD><TD>Cylinder Heads</TD></TR><TR vAlign=top><TD>7</TD><TD>9A564</TD><TD>Fuel Return Tubes</TD></TR><TR vAlign=top><TD>8</TD><TD>—</TD><TD>Piston Stage (Part of 9350)</TD></TR><TR vAlign=top><TD>9</TD><TD>9002</TD><TD>Fuel Tank</TD></TR><TR vAlign=top><TD>10</TD><TD>—</TD><TD>Diaphragm Stage (Part of 9350)</TD></TR><TR vAlign=top><TD>11</TD><TD>—</TD><TD>Fuel Filter Vacuum Switch (Part of 9155)</TD></TR></TBODY></TABLE>

Your mechanical pump shouldn't be adding air to the fuel, electric fuel pumps generally have this problem.

 

Cuda_Jim I was thinking the same thing, it's not air in the fuel.
The first thing that came to my mind is a problem with the HPOP system. The pressure sensor getting flaky or something like that.

 

Kwik, For some reason I double posted the picture above, Can you get rid of one of them please?

David, I just noticed the diagram doesn't show the tank switcher valve. Could be a source for air to enter the fuel system?

but I gotta agree with kwik. If your HPOP proves to be good you're in the market for injectors, yaahhh! more HP

 

When you loaded the attachment it became part of the post. There wasn't any need to upload to your gallery and attach it there as well. I left the original attachment and deleted the image.

 

If I recall I'm running around 500lbs+ for oil pressure when I hooked up the scanner at idle, the sensor is new, I guess I shoulda cleared up, the loop is being caused by a slight missfire....even kinda sounds like 2 of them missfireing, pinned it down to 6 and/or 8 cylinder otherwise holding consitently at 650rpm, when the misfireing worsens it'll drop and slowly pick up from 630 to 650 rpm. Seems to run good under acceleration

 

No problem about the tank switcher valve, thats easy after that anyways, just want to know the flow and shiat. Thanx for the Diagram.

I think I might bight the bullit and do the injector O-rings while I'm on holidays this week. What I want to do is install a clear fuel line some where and check the fuel as its entering the system for air. If thats good I pretty sure I gotta look at injectors, is it a little soon for 125,000 miles for the injectors to crap out?