'85 F250 6.9 electric fuel pump - Diesel Forum - TheDieselStop.com
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6.9L Diesels Technical discussion of topics related to vehicles powered by the 6.9 Liter In-Direct Injection Navistar engines.

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Old 05-28-2007, 11:35 PM   #1 (permalink)
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'85 F250 6.9 electric fuel pump

I'm making my first venture into the world of Ford/IHC Diesels with a purchase of a non-running '85/6.9. The previous owner stated that the truck was running, but acted like it wasn't getting fuel. Finally it died and wouldn't restart. This was approx 1 year ago. I'd like to get it started at his place so I don't have to trailer it home (if the brakes are good). Here are my thougths...
Purchase fuel/water separator, fuel filters, and spare fuel line. Start by changing the filters and trying to start it. If it still doesn't start, remove the shrader valve and check for fuel flow, if there is none, make sure there isn't restriction before the lift pump.
Now, (here's my main question..) if the lift pump is bad, where is the normal place to install the electric fuel pump? What brand/model number pump is used? What about a relay or power source?

Thanks all.
Luther
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'87 300SDL (271,xxx mi) new/used head-needs prechamber
'82 300CD (171 kmi) need front end rebuild
'85 Ford F250 IHC 6.9 4-speed
'82 300D (74 kmi) getting '85 donor engine
'85 300D (280,176) parts car-sans engine
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Old 05-29-2007, 05:41 PM   #2 (permalink)
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Re: '85 F250 6.9 electric fuel pump

This is the pump I've been using for the past year & a 1/2--both wvo and diesel.
http://store.summitracing.com/partde...94&FROM=MG
I mounted mine by the tank--most elec. pumps push better than they pull.

Make sure you check the pickup in the tank and if you go with the elec. pump don't leave the mech. pump in line with it.
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Old 05-29-2007, 06:15 PM   #3 (permalink)
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Re: '85 F250 6.9 electric fuel pump

I would by-pass the water separator just to get it home, the stock unit is a well known trouble spot for air leaking in to the fuel system.

I used a relay activated by the FSS (fuel shut-off solenoid) on the injection pump. I mounted a Holley Red Pump on the frame rail just in front of the fuel select valve. The red pump doesn't need a regulator, Summit Racing had the best price when I bought mine years ago.

Welcome to the site, I am currently looking at buying an 82 300D.
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Old 06-05-2007, 04:26 PM   #4 (permalink)
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Re: '85 F250 6.9 electric fuel pump

I second the Holley Red. Mine's been working on both diesel and WVO for over a year now.
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Old 06-05-2007, 06:33 PM   #5 (permalink)
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Re: '85 F250 6.9 electric fuel pump

I have a Carter as well. Half the cost of the Holley Red and works fine. I have the PermaCool water separator and filter between the fuel tank and electric pump, then up and through a 7.3 filter head with a 33617 filter on it. Been working great for over a year now!
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Old 06-05-2007, 10:50 PM   #6 (permalink)
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Re: '85 F250 6.9 electric fuel pump

Ok, so tonight I went to attempt to start the truck. I took a full set of tools, stopped by Advance Auto, and purchased a fuel filter and valve core tool. I tried to purchase some fuel line to bypass the fuel separator, but they didn't know the correct size.
So, I arrived at the truck, checked the fuel separator that was already bypassed (Alleluia!) hooked up the batteries, (praying that they had enough charge to start the truck) and turned the key once. Sure enough, there was enough charge.
So, at this point, I removed the fuel shrader valve core, and attached a length of clear hose into a gallon jug to check fuel flow. It took about 20-25 seconds of cranking to see several squirts of fuel into the hose.
Seeing that, I re-installed the valve core and made an attempt to start the truck. After about 25-30 seconds of cranking, it fired up and idled fine. I reved it up a little to check fuel flow, and it ran like I would expect. I didn't run it long, because the coolant system is currently empty.
Now, I noticed that several of the injectors are moist and several return lines are also moist. Since I make my own biodiesel, I will need to purchase viton fuel line, injector return line, and possibly viton injector o-rings. What size fuel lines does this engine use? Any sources for viton fuel lines and o-rings?
Next, maintenance items (other than fluid/filter changes) should I do that are specefic to this engine? Thanks all for the help so far.
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'87 300SDL (271,xxx mi) new/used head-needs prechamber
'82 300CD (171 kmi) need front end rebuild
'85 Ford F250 IHC 6.9 4-speed
'82 300D (74 kmi) getting '85 donor engine
'85 300D (280,176) parts car-sans engine
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Old 06-06-2007, 02:00 AM   #7 (permalink)
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Re: '85 F250 6.9 electric fuel pump

The return lines on the 6.9 are 3/16 ID.
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Old 06-06-2007, 06:01 PM   #8 (permalink)
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Re: '85 F250 6.9 electric fuel pump

What about the lines from the tank?
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'87 300SDL (271,xxx mi) new/used head-needs prechamber
'82 300CD (171 kmi) need front end rebuild
'85 Ford F250 IHC 6.9 4-speed
'82 300D (74 kmi) getting '85 donor engine
'85 300D (280,176) parts car-sans engine
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Old 06-06-2007, 09:32 PM   #9 (permalink)
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Re: '85 F250 6.9 electric fuel pump

I'm running 5/16" return lines and 3/8" from the tanks. Not sure if it's stock or not, but it works well. See below for fuel lines, and if you find viton o-rings that fit the 6.9 please PM me. I haven't looked yet, but will likely need them soon running bio.

The only place I've found that has viton hose for 6.9s is greaseworks.org. Personally I think they are really overpriced. You might want to consider purchasing some of the new viton-lined fuel injection hose. It has the durability of regular hose and the viton lining keeps the alcohol from degrading the hose prematurely. (it's actually designated as having a "fluoro-elastomer" lining but I think the only one in use right now is viton)

Look for hose labeled "SAE 30r9" It is usually printed on the hose itself. Here are a few of the brands I've found at local retailers:

Pep Boys: Dayco Gen II - they stock 5/16"ID and 3/8"ID. They will special order 1/4"ID for Suburban owners ($4.89/ft)

Autozone: Goodyear - no special label other than the SAE 30r9 designation and the telltale blue lining visible at the end of the hose. They stock 5/16"ID and 3/8"ID and say they can special order the 1/4"ID. ($4/ft). This is what I'm using now and so far so good.

Gates also makes a "GatesXL" fuel injection hose that's SAE 30r9

Hope this helps
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Old 06-07-2007, 11:34 AM   #10 (permalink)
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Re: '85 F250 6.9 electric fuel pump

The return line hose size is going to depend on what return T's the previous owner used. 6.9 and 7.3 T's are compatable, and interchangeable, but the 6.9 T's use smaller hose and the barbs are centered, where as the 7.3 T's use a larger hose and have offset barbs.
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Old 06-08-2007, 11:07 PM   #11 (permalink)
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Re: '85 F250 6.9 electric fuel pump

[ QUOTE ]
I second the Holley Red. Mine's been working on both diesel and WVO for over a year now.

[/ QUOTE ]

Me too, and no water separator [img]/ubbthreads/images/graemlins/eek.gif[/img]

Nate
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Old 06-09-2007, 10:44 PM   #12 (permalink)
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Re: '85 F250 6.9 electric fuel pump

AAAAHHHH, the system is sucking air from somewhere and I can't keep the truck running. The lift pump pulled 22"Hg vacuum in around 5-7 seconds of cranking, so I believe it is good.
I can pull fuel directly from the fuel tank and through the tank selector solenoid using my Mityvac. At the bypassed connection to the water separator, I could not pull fuel, so I think my problem might be in that run of fuel line.
I ran out of daylight at this point, so tomorrow I'm going to buy a 10' length of 3/8" fuel hose and bypass the tank selector and that longer length of hard fuel line. I will run fuel hose directly from the tank to the metal fuel line that runs under the engine. I hope that this solves the sucking air problem, and allows the truck to run like it should. More tomorrow after this.

Luther
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'87 300SDL (271,xxx mi) new/used head-needs prechamber
'82 300CD (171 kmi) need front end rebuild
'85 Ford F250 IHC 6.9 4-speed
'82 300D (74 kmi) getting '85 donor engine
'85 300D (280,176) parts car-sans engine
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Old 06-10-2007, 07:02 PM   #13 (permalink)
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Re: '85 F250 6.9 electric fuel pump

I made it home with the truck. Installed a new fuel line from the tank to the metal line that runs under the engine. Then I checked with the Mityvac at the shrader valve, and was still pulling bubbles in the fuel. So, I removed the return line and capped it with my thumb and that stopped the bubbles. Then I replaced that return line, and started the truck. Left it idle for about 10 minutes, then drove it around the block. It didn't die, so I drove it home with no issues.
All 4 injector o-rings on the right are leaking and it needs new return lines all the way around.
Thanks all for the help getting the "Bio-beast"home. I'm sure I'll have plenty of new questions in the next few weeks.

Luther
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'87 300SDL (271,xxx mi) new/used head-needs prechamber
'82 300CD (171 kmi) need front end rebuild
'85 Ford F250 IHC 6.9 4-speed
'82 300D (74 kmi) getting '85 donor engine
'85 300D (280,176) parts car-sans engine
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Old 06-11-2007, 11:29 AM   #14 (permalink)
ney
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Re: '85 F250 6.9 electric fuel pump

You may want to drop you fuel tank(s) and make sure the pick up tubes are still in tact. Diesel suck off the bottom of the tank. If the strainer is gone...(found out the hard way.plus had alge and all sorts of crap in the tank) you will suck air even with a half tank of fuel..
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Old 06-11-2007, 02:59 PM   #15 (permalink)
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Re: '85 F250 6.9 electric fuel pump

[ QUOTE ]
I have a Carter as well. Half the cost of the Holley Red and works fine. I have the PermaCool water separator and filter between the fuel tank and electric pump, then up and through a 7.3 filter head with a 33617 filter on it. Been working great for over a year now!

[/ QUOTE ]

I may be eating those words, my truck just stopped running for no apparent reason, won't run off either tank, both of which are new. Rear tank has a new pickup (less than a year old) from Ford, front tank has a used one in good shape when I put it in this spring! Fuel pump runs, but engine no make smoke!!! [img]/ubbthreads/images/graemlins/frown.gif[/img]

Will report back what was the culprit!
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