Viton seals not lasting - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 06-24-2013, 07:26 PM Thread Starter
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Viton seals not lasting

So I have a conversion that I did about a year ago. My WVO usually goes into the head between 170 and 200 degrees. Here is my issue:

Fuel lines are leaking at the head, where the seal is. Three times I have changed them. The first time they leaked, I figured it was because the factory seals were not Viton, so I replaced them. The second time they started leaking, the only thing I could figure was that maybe I had tightened them too tight and they "wore out", so I replaced them again and was careful not to over-tighten. Now leaking again! WTF? Its not like it is easy to replace the passenger side! They last about 2000 miles or so.

Any ideas? I am thinking I may want to run a different fuel line type without these seals, or....

Thanks in advance.
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post #2 of 8 Old 06-24-2013, 07:52 PM
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Where are you sourcing them?

I have never had one leak. weird

99 F350 7.3
320K w/ 150k+ on Biofuels

Casserly Stage 2's-TE Modded 17 HPOP
DP Tuner F6 & PMT1-Van Turbo Non EBPV & 6637
Twin Fass Pumps B100 & D2 Regulated Return- Fuel Lab
Isspro Pyro, Trans, Boost-Air and Fuel Temp
WVO processed by Simple Centrifuge
B100 by Biopro 190
B100 powered Excursion, F250 CCSB, and Two TDI Jettas
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post #3 of 8 Old 06-25-2013, 10:38 AM Thread Starter
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Quote:
Originally Posted by vegginpsd View Post
Where are you sourcing them?

I have never had one leak. weird
Riff Raff Diesel in Oregon. I assume they are the correct item; he seems to know what he is doing.
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post #4 of 8 Old 06-25-2013, 10:43 AM
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Quote:
Originally Posted by syngen smythe View Post
Riff Raff Diesel in Oregon. I assume they are the correct item; he seems to know what he is doing.

Clay definately knows his stuff.
Are you using the 1/4" vibrams?
There are 5/16" on the return that would cause leaking if used.

Be sure to polish up the lines with emery cloth when installing new ones. It helps make a better seal. I just cannot figure out why there is a problem. In fact, in a pinch I have re-used them, and also I made a set out of fuel line.

99 F350 7.3
320K w/ 150k+ on Biofuels

Casserly Stage 2's-TE Modded 17 HPOP
DP Tuner F6 & PMT1-Van Turbo Non EBPV & 6637
Twin Fass Pumps B100 & D2 Regulated Return- Fuel Lab
Isspro Pyro, Trans, Boost-Air and Fuel Temp
WVO processed by Simple Centrifuge
B100 by Biopro 190
B100 powered Excursion, F250 CCSB, and Two TDI Jettas
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post #5 of 8 Old 06-25-2013, 11:01 AM Thread Starter
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Parker 60VLV-4 Viton Sleeve (1/4 inch)

Only thing I can imagine is maybe too tight again? ever had that issue?

I also have two heat exchangers so the oil gets hot on occasion- I have seen up to 250 going in when towing... not recently though.
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post #6 of 8 Old 06-25-2013, 11:09 AM
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You have VO in your factory steel lines?

99 F350 7.3
320K w/ 150k+ on Biofuels

Casserly Stage 2's-TE Modded 17 HPOP
DP Tuner F6 & PMT1-Van Turbo Non EBPV & 6637
Twin Fass Pumps B100 & D2 Regulated Return- Fuel Lab
Isspro Pyro, Trans, Boost-Air and Fuel Temp
WVO processed by Simple Centrifuge
B100 by Biopro 190
B100 powered Excursion, F250 CCSB, and Two TDI Jettas
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post #7 of 8 Old 06-25-2013, 12:32 PM Thread Starter
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Quote:
Originally Posted by vegginpsd View Post
You have VO in your factory steel lines?
I installed a "T" after the factory fuel pump, before the lines that go to the heads. There are check valves on each end of the "T" . By switching fuel pumps, I switch fuel source. So there is VO in the factory lines going to the heads, and that VO is purged for a few minutes before shut down.
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post #8 of 8 Old 06-25-2013, 12:55 PM
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Quote:
Originally Posted by syngen smythe View Post
I installed a "T" after the factory fuel pump, before the lines that go to the heads. There are check valves on each end of the "T" . By switching fuel pumps, I switch fuel source. So there is VO in the factory lines going to the heads, and that VO is purged for a few minutes before shut down.

I am going to tell you excess heat. For no other reason than it MAY solve your problem if you correct the plumbing errors in your system.

VO in the steel lines and in the filter housing is really, really bad, FYI.

99 F350 7.3
320K w/ 150k+ on Biofuels

Casserly Stage 2's-TE Modded 17 HPOP
DP Tuner F6 & PMT1-Van Turbo Non EBPV & 6637
Twin Fass Pumps B100 & D2 Regulated Return- Fuel Lab
Isspro Pyro, Trans, Boost-Air and Fuel Temp
WVO processed by Simple Centrifuge
B100 by Biopro 190
B100 powered Excursion, F250 CCSB, and Two TDI Jettas
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