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Old 05-03-2019, 06:32 AM   #1 (permalink)
rude robert
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Rock Auto ffm?

Hi I was trying to find the ffm on the Rock Auto sit and i can't locate it under the fuel section. The truck runs great the stops about once every week and then it won't start for 24 hours lol. I have replaced and done some mods. The only thing i have not replaced was those ffm orings. Where would i get those and how do i replace them. Should i just buy a new ffm too? The truck is at work, it stalled and that is where she stayed. Thank you for the suggestions.

__________________
1994 GMC 2500 6.5 turbo diesel(dad gave me the truck before he passed away)
Cleaned all grounds
acdelco Oil sending unit
new ffm filter.
all rubber fuel lines replaced inside engine compartment
fuel tank everything new on this(except the tank)
new sending until new fuel lines and hoses to tanks and lines going to lp.
130000 on the engine, hoping I can put another 10000 plus on it
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Old 05-03-2019, 06:45 AM   #2 (permalink)
rude robert
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Hi is the the part number ACDELCO 10226035?

I'd like to check the o rings first

is the a way to check it the ffm is working properly too, is there a heater on it. If so if the heater is not working will that cause a problem. Sorry this is the only thing that has not been worked on lol

__________________
1994 GMC 2500 6.5 turbo diesel(dad gave me the truck before he passed away)
Cleaned all grounds
acdelco Oil sending unit
new ffm filter.
all rubber fuel lines replaced inside engine compartment
fuel tank everything new on this(except the tank)
new sending until new fuel lines and hoses to tanks and lines going to lp.
130000 on the engine, hoping I can put another 10000 plus on it
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Old 05-03-2019, 08:02 AM   #3 (permalink)
OkDually
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Quote:
Originally Posted by rude robert View Post
Hi I was trying to find the ffm on the Rock Auto sit and i can't locate it under the fuel section. The truck runs great the stops about once every week and then it won't start for 24 hours lol. I have replaced and done some mods. The only thing i have not replaced was those ffm orings. Where would i get those and how do i replace them. Should i just buy a new ffm too? The truck is at work, it stalled and that is where she stayed. Thank you for the suggestions.
You can find the info on the FFM at rock auto here:
https://www.rockauto.com/en/moreinfo...949633&jsn=257
Just enter in the part number into the rock auto search engine and the part will pop up.

The O Rings can be purchased at online sites like Leroy Diesel.
Part numbers can be located in the "Parts List" section of the FAQ:
Fuel Filter Heater O Ring - GM: 12511962
Water In Fuel O Ring - GM: 12511959

The heater is located on the bottom.
Grab the bottom of the FFM and just unscrew the heater base.
replace the o ring and reinstall the heater.

The water in fuel sensor has two screws holding it onto the side of the FFM, remove those and pull the sensor out to expose the o ring.
Replace the o ring and reinstall the sensor.
Here are a couple of pics for reference:
https://www.dieselplace.com/forum/63...ml#post2461279
__________________
1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
OptiLube summer + Formula


Proud member #1039 of The 3500 Dually Club


Last edited by OkDually; 05-03-2019 at 08:10 AM.
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Old 05-03-2019, 08:08 AM   #4 (permalink)
OkDually
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Quote:
Originally Posted by rude robert View Post
Hi is the the part number ACDELCO 10226035?

I'd like to check the o rings first

is the a way to check it the ffm is working properly too, is there a heater on it. If so if the heater is not working will that cause a problem. Sorry this is the only thing that has not been worked on lol
Since you are in a warm California climate your fuel heater would rarely be used.
A visual inspection of the FFM interior to make sure it is clean and the small screen down inside of the bottom is clean as well.
To check for any leaks you can remove the FFM and pressurize it with some air.
__________________
1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
OptiLube summer + Formula


Proud member #1039 of The 3500 Dually Club

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Old 05-03-2019, 08:27 AM   #5 (permalink)
rude robert
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Thank you I have green hnbr orings will they work if I have the sizes until I can get Leroy to send them. I see a set for 3 at Leroy but it's not the same discrimination thanks
__________________
1994 GMC 2500 6.5 turbo diesel(dad gave me the truck before he passed away)
Cleaned all grounds
acdelco Oil sending unit
new ffm filter.
all rubber fuel lines replaced inside engine compartment
fuel tank everything new on this(except the tank)
new sending until new fuel lines and hoses to tanks and lines going to lp.
130000 on the engine, hoping I can put another 10000 plus on it
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Old 05-03-2019, 08:27 AM   #6 (permalink)
rude robert
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They have never been changed
__________________
1994 GMC 2500 6.5 turbo diesel(dad gave me the truck before he passed away)
Cleaned all grounds
acdelco Oil sending unit
new ffm filter.
all rubber fuel lines replaced inside engine compartment
fuel tank everything new on this(except the tank)
new sending until new fuel lines and hoses to tanks and lines going to lp.
130000 on the engine, hoping I can put another 10000 plus on it
Offline   Reply With Quote Quick reply to this message
Old 05-03-2019, 09:06 AM   #7 (permalink)
OkDually
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Quote:
Originally Posted by rude robert View Post
Thank you I have green hnbr orings will they work if I have the sizes until I can get Leroy to send them. I see a set for 3 at Leroy but it's not the same discrimination thanks
The O rings are a Vitron material that is Diesel Fuel rated and withstand the high temps from the Diesel Engine.


Hnbr is of lesser quality and will break down with prolonged heat.
If you don't see the correct parts on Leroys site just call him directly.
He has them
__________________
1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
TD-Max boost controller - Kennedy Diesel
OPS extension hose - Leroy Diesel
Glow Plug Harness- PT Wiring Solutions
Glowshift Maxtow EGT,Boost, Fuel gauges
Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
GM-5 Turbocharger
4.10 gear ratio
OptiLube summer + Formula


Proud member #1039 of The 3500 Dually Club

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Old 05-03-2019, 12:13 PM   #8 (permalink)
JMJNet
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If there is a local racing or hydraulic shop, they usually stock all sizes of o-rings with different material including viton.

Bring the current o-ring or even the FFM to get the size.
There are 2 o-ring, the pesky one is the one at the fuel heater.
You need to take out the whole FFM to replace the o-rings.
The bottom where the heater is threaded like the retainer ring at the top.
The o-ring is somewhere there.
Another o-ring is on the side with the electrical part on the side held by 2 screw.
When you unscrew it, there is an o-ring there.
For this particular one, I got the o-ring from assortment viton/fuel o-ring in the "HELP" section in any part store, at least the package use to have the word "HELP".

As far as FFM goes, you need to check if the hole where the wires output, at the side closer to the bottom, is still intact, in other words, the grommet still covers the hole.
If you can see a gapping hole, you may just want to buy the new FFM.
The one in my truck have a gapping hole which is not leaking fuel all the time but when the engine run, it starts to trickle fuel slowly.
I had already replaced the o-rings.

Amazon also sells the FFM, they can get it in 2 days with Prime if you have Prime.

The new FFM seems to have a better built at least better than the FFM for 95 year.
Yours is 94, so it probably have a similar FFM, if it has not been replaced before.
__________________
1995 GMC Suburban:
PMD in Bumper
Leroy Diesel Flight System PMD
Leroy Diesel Oil Cooler Line
4" Warpspeed Exhaust
Kennedy Diesel LP/OPS Harness
Bosch Duraterm GP
Heath Turbo-Master
AD244 Alternator

Last edited by JMJNet; 05-03-2019 at 12:24 PM.
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Old 05-03-2019, 12:36 PM   #9 (permalink)
Sirleitet
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What you're describing if what my truck did last year. Once it started it ran awesome, but when I shut it off it would refuse to start until the batteries die or if I waited several hours.


It was the pmd. I got a new one from 1aauto with lifetime warranty, and I hope I don't have to use it.
__________________
1995 Chevrolet Cheyenne K2500 6.5TD / Suzuki Katana GS650G
Mods: Racor 690r fuel filter/w heater, new front face, new radiator and support bushings. Repaired both cab corners & frame. (Rust.)
Relocated PMD, DIY extended wiring harness. # of PMD replaced since owned truck in 2013: 5.
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Old 05-03-2019, 05:13 PM   #10 (permalink)
rude robert
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I replaced with a new pmd from leroys a few years ago along with the relocation kit behind the front license plate. I hope that its not going out lol..

__________________
1994 GMC 2500 6.5 turbo diesel(dad gave me the truck before he passed away)
Cleaned all grounds
acdelco Oil sending unit
new ffm filter.
all rubber fuel lines replaced inside engine compartment
fuel tank everything new on this(except the tank)
new sending until new fuel lines and hoses to tanks and lines going to lp.
130000 on the engine, hoping I can put another 10000 plus on it
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