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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 06-17-2006, 03:03 AM   #1 (permalink)
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Fuel Line Flush

I blend 25% WVO (Filtered Vegetable Oil) to my #2 diesel... and I think that this last time around I mixed it when the temp was too cold.

Long story short, I think I have some WVO that coagulated at the bottom of my fuel tank, and is sucked into my fuel lines.

My truck won't start now, only has about 1-2 cylinders firing before it dies.

Can anyone give me some advice on how to flush out my fuel lines?

Many thanks in advance.

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Old 06-17-2006, 08:01 AM   #2 (permalink)
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Re: Fuel Line Flush

Probably clogged the fine mesh screen going into the fuel pump before it actually clogged a line, also is your fuel Filter clean? I think when people are running that stuff they usually put a prepump filter on also. Like a Dahl 100. Just a thought. I would pull the pump first, and see what it looks like into the end. Also back flush the line to the tank, with very small amount of air pressure, (I would say 10 lbs or so. Maybe forward to the filter housing too? With the cap off the filter housing and a rag laying over it. But if the WVO is the culprit I bet it is the pump screen. Or the pump itself now....
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Old 06-17-2006, 08:39 AM   #3 (permalink)
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Re: Fuel Line Flush

Check your engine fuel filter to see if its plugged. I would try using a heat gun or a blow dryer to warm the tank by the pick up and the lines. Also warm the fuel pump body itself. I would do this even if you intend to back flush with tsome air as Jim suggested You didn't say how cold but at 25% you shouldn't be having a problem unless there is a lot of fat inyour WVO (waste vegetable oil right?) or SVO straight vegetable oil.
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Old 06-17-2006, 10:07 AM   #4 (permalink)
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Re: Fuel Line Flush

Thanks for the responses... I guess I know what on my "to do" list for Saturday.

The fuel filter is OK... that is the first think I checked.

Can you give me the location of the "fine mesh screen" and the fuel pump you are talking about?

Thanks


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Old 06-17-2006, 02:12 PM   #5 (permalink)
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Re: Fuel Line Flush

OK... here is what I am now trying to do...

I opened the purge valve on the fuel filter, and took off the front (pressurized) fuel fitting from the pump.

Gravity drained out the stuff in that line.

Now my plan is to use a "poor-man's" gas tank.... by reattaching the front fuel fitting to the pump, and UNATTACHING the rear fuel line (and plugging it with a screw).... then running a set of 1/4" or 3/8" fuel line into a 5 gallon diesel can.

This (should) allow me to quickly get #2 back into the engine and get it running again... and allow me to figure out what I am going to with with the stuff in my tank.

HOWEVER.... on the fitting on the REAR of the fuel pump, there is a plastic blue clip that seems to hold the fuel line on. I can't figure out how to remove this thing.... and I have already mangled the crap out of it with a screwdriver. Does this require a special tool?

Does anyone have a hint as to how this is removed?

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(Running Vegistroke WVO system (HIH)--> 75,000 MILES AND COUNTING!)
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Old 06-17-2006, 05:58 PM   #6 (permalink)
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Re: Fuel Line Flush

You should be able to pull the clip off by hand. If not, use a pair of needlenose pliers. Now would be a good time to replace that hose with a 14" long piece of fuel rated hose. Just use hose clamps at each end. The o-ring style connection from the factory can allow air into the fuel line.
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Old 06-17-2006, 06:59 PM   #7 (permalink)
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Re: Fuel Line Flush

I dont think you can pull it off by hand. GO to any autoparts store and they should have quick disconnect tools. Like for fuel lines, ect... They are cheap and good to have around. Yes, I myself would take the QD out completely and put on fuel line with double clamps.
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Old 06-17-2006, 07:10 PM   #8 (permalink)
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Re: Fuel Line Flush

DO NOT try and pull out the blue clip!!! Only the white clips are removeable. Ford's hoses with blue or green clips are designed to be removed by squeezing them in with a needlenose pliers.

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Old 06-18-2006, 02:59 AM   #9 (permalink)
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Re: Fuel Line Flush

[ QUOTE ]
Can you give me the location of the "fine mesh screen" and the fuel pump you are talking about?

[/ QUOTE ]

There are two "fine mesh screens" inside the tank if yours is stock. They are inside the fuel recirculation thingy that thermostatically sends warmer return fuel back into the supply to the pump. If they are clogged, you should probably just do the "in-tank mod" and remove the fuel recirculation thingy. Check ITP for a kit and on-line instructions. Then put a good quality in-line filter between the tank and the fuel pump.

From your later post, I'm assuming you found the fuel pump. My fuel lines HAD a metal clip and QD fittings that take a tool to remove. Shoves inside the connector and pushes back the latches allowing it to come loose.
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Old 06-18-2006, 11:02 AM   #10 (permalink)
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Re: Fuel Line Flush

Day 3... ugh.

Thanks for everyone's input so far.

Questions: Can anyone describe "fuel pump" behavior? I key the ignition to the "on" position, and the fuel pump runs for about 10 seconds before stopping. I get a "trickle" of fuel, and that's it. (Maybe a "shot glass" worth of fuel comes out from the front of the pump before it stops.... (remember that I have the front fuel line disconnected at this point).

Should the quantity be higher? I figured that since the fuel lines needed to be pressurized to ~60PSI, then the fuel pump would constantly be working to pressurize the lines.... (giving me the ability to use the fuel pump to flush the lines).

Yes, I found the fuel pump, but never saw the screens. If there was ever a time to drop the fuel tank... this would be it. I have nearly every ounce of fuel drained from it. (I shoved a garden hose down inside the filler neck and pumped it all out into a 55 gallon drum).

If I somehow determine whether I have a plugged screen/bad fuel pump in the works, I would be a happy man.

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"7/5 children suffer from ADHD... won't you help?"

(Running Vegistroke WVO system (HIH)--> 75,000 MILES AND COUNTING!)
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Old 06-18-2006, 01:41 PM   #11 (permalink)
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Re: Fuel Line Flush

You should have a MUCH Larger volume of fuel than that. It is definately a problem with the pump. If you have fuel in the truck, and dont have clogged lines leading to the pump, your pump is gone...sorry. They are not cheap either. If it is RUNNING,,,then it isnt the fuel pump relay, or any fuses, obviously. It is the pump shot....my best guess.
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Old 06-18-2006, 10:03 PM   #12 (permalink)
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Re: Fuel Line Flush

Ok.... so.... shot fuel pump.

When I got the back side hose disconnected (low pressure side to tank), I was able to blow air back through to the tank. Would that mean that my "mesh screens" are ok, or not?

On the assumption that it's NOT... can anyone tell me if I have to drop the tank to get to the mesh screens inside, or whether they are removable from the outside?

(No whammies... no whammies)

(And if I do have to drop the tank in the Excursion, does anyone have a DIY link for it somewhere?)

I also want to thank everyone for their assistance in this. I could not have gotten this far without all of your input.

Halitosis
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1995 BMW (Euro-spec!) M3
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"7/5 children suffer from ADHD... won't you help?"

(Running Vegistroke WVO system (HIH)--> 75,000 MILES AND COUNTING!)
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Old 06-18-2006, 10:14 PM   #13 (permalink)
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Re: Fuel Line Flush

The screens are probably just fine. Unless you want to do the "Intank mods" Not a terrible idea. But I dont know if I am going to be doing this to my new truck or not for sure.
I didnt notice a difference when I did the 99. (If you dont have air problems, there will be little difference, IF you ARE having air in the fuel then the mod helps...
Dropping the tank if your empty is no big deal. It is plastic, there are two straps with two bolts. You have a big skid plate, those two straps, drop the tank slowly and disconnect the lines.
Really dont think you need to drop it though,,like I said, unless you want to do the mods.
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Old 06-19-2006, 02:35 PM   #14 (permalink)
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Re: Fuel Line Flush

One more question: are fuel-pumps self-priming?

My fuel tank is essentially dry, and there is no fuel in the lines right now.

In the Excursion tank (from what I can tell), the lines have to travel UP a tube, then DOWN to the frame rail... so gravity won't privide the initial flow to the pump.

I would hate to burn out a second pump trying to get the fuel.... not knowing that there was some other procedure to go through...

Halitosis
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7.3L PSD -- 170,000 Miles
Hellwig Sway Bar
Firestone Ride-Rite Air-Helper Springs
203* Thermostat
Teconsha Prodigy Brake Controller
Sirius Satellite Radio

1995 BMW (Euro-spec!) M3
1974 Human Wife
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"7/5 children suffer from ADHD... won't you help?"

(Running Vegistroke WVO system (HIH)--> 75,000 MILES AND COUNTING!)
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Old 06-19-2006, 03:03 PM   #15 (permalink)
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Re: Fuel Line Flush

Take an air compressor with a regulator on the outlet and turn it down to 10-15 PSI. Put the hose down in the filler neck and kinda hold a rag or something around it to seal it just a little, the idea is to put a little positive pressure on the system to help the fuel get to the pump. Probably take two people, one to hold the hose and one to start the truck. 106
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