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CATEGORY LISTINGS > CATERPILLAR > class 8 fuel systems [ REFRESH ]
Thread Title:

class 8 fuel systems


Created On Wednesday March 03, 2004 17:22 Diesel Talk
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pntcont
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Posts: 6
Joined: May 2003

Note Wednesday March 03, 2004 17:22 View thread in raw text format
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Hello,

I need information on class 8 truck fuel tanks as I am trying to resolve an issue of fuel aeration in these tanks.

First I am not familiar with fuel tank design, so please bear with my questions.

* Are fuel tanks on class 8 trucks vented to the atmosphere?
* If not what model year was the practice discontinued?
* If the tanks are not vented to the atmosphere is there a slight pressure or vacuum in the tanks? or is this condition dependent on the engine chassis combination and manufacturer?

* There has all ways been a lot of fuel returned to the fuel tanks because fuel is used to cool the fuel injectors. Do the latest fuel systems incorporating 25,000+psi injectors by-pass more fuel to the fuel tank than older injection systems?
* Do fuel tanks incorporate a fuel return system to take care of cavitation induced fuel aeration?
* Is it the design responsibility of the tank manufacturer to make sure aerated fuel is not being delivered to the engine fuel pump?
* Is there a certain percentage of fuel aeration that is acceptable?

Thank you

pntcont@racc2000.com
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Dieseldoc
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Posts: 15
Joined: Feb 2004

Note Thursday March 04, 2004 07:59 View thread in raw text format
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* Are fuel tanks on class 8 trucks vented to the atmosphere?......... Yes, as far as I know

* If not what model year was the practice discontinued?............N/A

* If the tanks are not vented to the atmosphere is there a slight pressure or vacuum in the tanks? or is this condition dependent on the engine chassis combination and manufacturer?.........N/A

* There has all ways been a lot of fuel returned to the fuel tanks because fuel is used to cool the fuel injectors. Do the latest fuel systems incorporating 25,000+psi injectors by-pass more fuel to the fuel tank than older injection systems?..........Never measured it , some earlier models fuel return was from pump.

* Do fuel tanks incorporate a fuel return system to take care of cavitation induced fuel aeration?.......Never seen it happen.

* Is it the design responsibility of the tank manufacturer to make sure aerated fuel is not being delivered to the engine fuel pump?..........never had problem with aerated fuel from tank design.

* Is there a certain percentage of fuel aeration that is acceptable?............Any bubbles in sight glass, coupled with fuel pressure or power problems is a problem.

-------------------------
 Heavy Duty Mechanical Services
HdMechanical.com
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MotorCityMotorMan
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Joined: Apr 2004

Note Wednesday April 21, 2004 23:16 View users profile View thread in raw text format
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Fuel Tanks must be vented to atmosphere. Had a John Deere combine tank collapse because vent line became plugged (covered) with soybean dust.

-------------------------
 John Arting
Sr. Engine/Dyno Technician
Bearing Specialist
Federal Mogul Technical Center
Plymouth, Michigan
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enginebob
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Joined: May 2004

Note Sunday May 09, 2004 01:50 View thread in raw text format
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Where are you seeing the aireation at? Is it at pump suction ? Or just looking into the fuel tank?

-------------------------
 With enough power anything can fly
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