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post #1 of 17 Old 02-09-2010, 03:53 PM Thread Starter
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Fuel system diagram

I am looking for a fuel system diagram for a 2003 f-250 7.3 thank you for any help.
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post #2 of 17 Old 02-09-2010, 03:59 PM
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What exactly do you want to know.

Is it the fuel supply diagram or for the fuel system.


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2005 6.0 Crew Cab Long Box Lariat, current truck

2004 6.0 destroyed by contaminated fuel

2002 7.3L burnt
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post #3 of 17 Old 02-09-2010, 05:11 PM Thread Starter
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Hi, I wanted make sure there wasn't a second fuel filter, and make sure that what I see on the frame rail is the fuel pump?
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post #4 of 17 Old 02-09-2010, 05:20 PM
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Yep that's it. About under the driver's seat. And the only filter is up above the V in the engine.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #5 of 17 Old 02-09-2010, 05:20 PM
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if you talking about the drivers side rail under the drivers feet... that is the fuel pump
post #6 of 17 Old 02-09-2010, 05:33 PM
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Quote:
Originally Posted by jesilvas View Post
Yep that's it. About under the driver's seat. And the only filter is up above the V in the engine.
I will give you 1/2 correct on this.

There is two fuel screens in the tank. This is called a mixing chamber. The only way to get to them is to open the tank up. Now you can either remove the bed. Or drop the tank.

Also there is a screen on the fuel pick up. This is a big screen, the mixing chamber has two fine screens, then your pump, then the fuel filter on the engine.


Fuel goes into the tank through the filler tube. From there it goes up the pick up tube to the mixing chamber. From there it goes into the fuel supply line to the fuel pump. Then from the fuel pump to the fuel filter/water seperator on top of the engine. from there the fuel goes to the fuel rails to the injectors. From the injectors it goes into the cylinder, is burned and sent out the exhaust.

Excess fuel is sent back to the tank.

Ok that is your fuel system.


Your Actions Today, Decide Your Future Tomorrow

2005 6.0 Crew Cab Long Box Lariat, current truck

2004 6.0 destroyed by contaminated fuel

2002 7.3L burnt
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post #7 of 17 Old 02-09-2010, 05:36 PM
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Oh picky picky :

Yea he's right.



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post #8 of 17 Old 02-10-2010, 01:07 PM Thread Starter
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thank you !
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post #9 of 17 Old 11-05-2010, 04:39 PM
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i would like to see a diagram.. my 2k 7.3 was running great, got some bad fuel and didnt know it while i was out of town. had to change filter and ran great again, then evidently had momentary probs with fuel guage and ran out of fuel( although guage said 1/4, until i had turned the switch off and then tried to crank then it said OUT) . two days ago it did the "running out of gas" imitation but if i held the pedal down it would have rough running high rpms but would only go about 20 mph. i made it home( its on 1/2 tank) i drained the fuel res. and saw way too much water. i changed filter and it idled rough but ran. i went down the road and it began to do the running out thing again. and now will turn over fast enough to build pressure but wont start.

no one around here will work on a diesel so i guess im on my own( not going to ford place if i can help it) one guy looked at it and said something about an actuator just in front of the res that wasn't clicking when i turned the switch. but i don't remember what he called it, and there was alot of sludge in the res when i changed the filter , which i cleaned out with a shop vac and a straw. so surely something is stopped up right? if it were a pump wouldn't i have had warning signs?
im thinking about pulling tank, and pump to blow lines clean with air but the actuator thing could be something that sticks with sludge in it
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post #10 of 17 Old 11-08-2010, 06:37 AM
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Quote:
Originally Posted by afd202 View Post
i would like to see a diagram.. my 2k 7.3 was running great, got some bad fuel and didnt know it while i was out of town. had to change filter and ran great again, then evidently had momentary probs with fuel guage and ran out of fuel( although guage said 1/4, until i had turned the switch off and then tried to crank then it said OUT) . two days ago it did the "running out of gas" imitation but if i held the pedal down it would have rough running high rpms but would only go about 20 mph. i made it home( its on 1/2 tank) i drained the fuel res. and saw way too much water. i changed filter and it idled rough but ran. i went down the road and it began to do the running out thing again. and now will turn over fast enough to build pressure but wont start.

no one around here will work on a diesel so i guess im on my own( not going to ford place if i can help it) one guy looked at it and said something about an actuator just in front of the res that wasn't clicking when i turned the switch. but i don't remember what he called it, and there was alot of sludge in the res when i changed the filter , which i cleaned out with a shop vac and a straw. so surely something is stopped up right? if it were a pump wouldn't i have had warning signs?
im thinking about pulling tank, and pump to blow lines clean with air but the actuator thing could be something that sticks with sludge in it
id pull the tank like you said. then flush the system by drainign the fuel bowl, and fillingand draining again, i dont know if you can do this with the filter out or not (may spray everywhere) if you have two tanks, then you could have a bad switch port/pollak valve.

-Matt

Late 99 (2/99) Black F250, CC LB 4x4 Lariat 214k. All Stock for the moment...

1995 PSD, ext cab, one wheel wonder , 297k miles, 30k on wvo. totaled 5/8/11 RIP This truck is for sale as a parts truck (Jason is about to receive forged rods, and drop kick his PMR's)
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