Fuel Pressure or Turbo problem with my Cummins

For discussing the modifications needed for diesel vehicles to run with 2 tank veggie oil conversions.

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Fuel Pressure or Turbo problem with my Cummins

Postby knoxbiobenz » Thu Jun 24, 2010 4:24 pm

I have a 95 Cummins and I have a 2-tank setup that is very similar to Sun's.

This is a problem that I know will probably not be solved in one quick post but I am just trying all options now and am open to any and all ideas.

I have driven close to 30K Miles so far on the system and I have loved it so far. Then only problem is that I have killed 3 lift pumps. 2 of them were Airtech Pumps from O'Reileys and I think that there is a possibility that I just killed the recent Delphi Pump that I bought from NAPA. the other was the original one that was on the truck when I bought it.

My question is this.. Do you think that there is a possibility there is something else going on that I am not seeing??

Is it really the Turbo and the fresh new pumps just help it a little in the beginning?

The recent symptom is that I plugged a VO filter and then I changed it and got 500 miles on it. Now when the truck is on VO I am hitting a plateau of about 75mph and then the truck slows down to around 60 or 65 mph. I can switch the VO over to the other (diesel) filter and then it boosts back up to 75 or 80 and it flutters and then goes back and forth b/w 65 and 75 or so.

It is not driving at a constant RPM/Speed on the diesel filter.
On the VO filter it is just dieing when under load.
I have changed both filters recently and I do not think that I have any fuel leaks.

Thanks for the help Guy's I will be checking in later on tonight.
Zack Smith
1995 Dodge Cummins 2500, 194,xxx miles
2- Tank System Designed from Sun's
25,000 VO miles

1984 MB 300D- Sold
1983 MB 300TD- Sold
1980 MB 300SD- Sold
knoxbiobenz
 
Posts: 40
Joined: Thu Dec 25, 2008 9:08 pm
Location: Knoxville, TN

Postby knoxbiobenz » Thu Jun 24, 2010 8:08 pm

We'll she died on me in the Kroger parking lot. Thank goodness I have AAA and they were there in 30 min.

The only place I know to start is by replacing the lift pump and then going from there. I am just sick and tired of replacing them and I think that it is just a symptom of a greater problem.

We will see Guy's.
Thanks,
Z
1995 Dodge Cummins 2500, 194,xxx miles
2- Tank System Designed from Sun's
25,000 VO miles

1984 MB 300D- Sold
1983 MB 300TD- Sold
1980 MB 300SD- Sold
knoxbiobenz
 
Posts: 40
Joined: Thu Dec 25, 2008 9:08 pm
Location: Knoxville, TN

Postby SunWizard » Thu Jun 24, 2010 8:31 pm

Do you have a fuel pressure guage? That would tell you what is going on.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
Low fossil net zero house- 100% solar power and heat.
SunWizard
Site Admin
 
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Joined: Mon Dec 11, 2006 2:53 pm
Location: N. Colorado

Postby knoxbiobenz » Fri Jun 25, 2010 7:51 pm

No I do not have a fuel gauge.
What brand do you recommend?

I have a friend who has one and he says that his flutters very bad.\

Where do you recommend putting it?
1995 Dodge Cummins 2500, 194,xxx miles
2- Tank System Designed from Sun's
25,000 VO miles

1984 MB 300D- Sold
1983 MB 300TD- Sold
1980 MB 300SD- Sold
knoxbiobenz
 
Posts: 40
Joined: Thu Dec 25, 2008 9:08 pm
Location: Knoxville, TN

Postby SunWizard » Fri Jun 25, 2010 11:06 pm

knoxbiobenz wrote:No I do not have a fuel gauge.
What brand do you recommend?

Any cheap oil pressure gauge from any auto parts store. I like the 120 degree needle sweep ones best since they are easier to read.
I have a friend who has one and he says that his flutters very bad.\

No flutter if you put a needle valve in the line to the gauge as I discuss and show pics on page 1 of my conversion thread here.
Where do you recommend putting it?

See pics, in a tee in the line just after FPHE before the IP.
YVORMV - Your veg. oil results may vary.
95 Dodge Cummins 4x4 SVO WVO conversion.
81 Mercedes 300D- stock and happy on V80/D20 blend.
Low fossil net zero house- 100% solar power and heat.
SunWizard
Site Admin
 
Posts: 1719
Joined: Mon Dec 11, 2006 2:53 pm
Location: N. Colorado

Postby knoxbiobenz » Sat Jun 26, 2010 11:31 am

OK, I think that I found the pic of the needle valve.
I will install it just like yours, right next to my temp sensor.


Next conversion I do will not have any fuel lines bent so that they might kink. I have been stranded 3 times now due to a kinked fuel line.

I also noticed when I was down there that a spring that is part of the fuel/throttle linkage was broken so the IP was not able to function properly.

I rigged it so that it works, now I need to find the right one and replace it.

Thanks Sun,
1995 Dodge Cummins 2500, 194,xxx miles
2- Tank System Designed from Sun's
25,000 VO miles

1984 MB 300D- Sold
1983 MB 300TD- Sold
1980 MB 300SD- Sold
knoxbiobenz
 
Posts: 40
Joined: Thu Dec 25, 2008 9:08 pm
Location: Knoxville, TN

Cummins lift pump article may answer your questions

Postby strokercummins » Mon Aug 23, 2010 3:03 pm

Good afternoon

I just finished writing a 3 1/2 page article on the Cummins fuel system and lift pump. This valuable information is based on hundreds of tests and 14 months of work. This article is number one in a six part series. I thought this would be of interest to the forum. Feel free to post the link, publish it, or share with your diesel friends. I want to get this information into the hands of 4 x 4 users, diesel performance enthusiasts and Cummins truck owners.

Best regards,

Rob Parelli Sr
Tork Teknology

This is the link to article number one http://torkteknology.com/news.php?newsid=5
strokercummins
 
Posts: 6
Joined: Mon Aug 23, 2010 2:56 pm
Location: Michigan


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