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Engine Discussion of preventative/corrective maintenance and other technical issues regarding your coach's engine.

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  #1  
Old 04-08-2010
hltsystems hltsystems is offline
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Default 1987 PT38 fuel delivery problem Detroit 928V

I am not getting any fuel from the tank to the Detroit fuel filter system on the Rt side of the engine. I assumed there is an aux fuel pump near the fuel tank (300 gal) but I cannot find it from below. The fuel ine goes from the filter directly into the rt side frame rail and disappears. Any help would be appreciated.

Harold
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  #2  
Old 04-08-2010
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Ed Wimberley Ed Wimberley is offline
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Harold
On my 6V92's fuel comes from Racor filter to fuel pump on motor.
Then it goes to primary fuel filter at which time it splits 1 to left bank 1 to right bank. If you are not getting fuel to either side I would think you have a problem with the filter output lines to the banks. Do you have a pressure gauge on filter?
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  #3  
Old 04-08-2010
hltsystems hltsystems is offline
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Ed, thanks for the reply. No fuel pressure guage, other than that, it is setup as you describe. Is there an electric fuel pump located near the fuel tank? I noted posts conerning the FC series that describe a "Fasco" pump located by the tank (in the FC the tank would be in the rear instead of the middle of the coach). I cannot see the engine pump drawing the fuel all way from the tank located 25' away and then recirculating it through the injector system and eventually returning some back to the tank...but I do not have any documentation except the BB book and it does not cover this problem.
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Old 04-08-2010
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curtsprenger curtsprenger is offline
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Quote:
Originally Posted by hltsystems View Post
I am not getting any fuel from the tank to the Detroit fuel filter system on the Rt side of the engine. I assumed there is an aux fuel pump near the fuel tank (300 gal) but I cannot find it from below. The fuel ine goes from the filter directly into the rt side frame rail and disappears. Any help would be appreciated.

Harold
Harold...read the site rules and set up you signature before the forum moderators remind you.

No electric fuel pump between the tank and the Racor filter unless one was added. Were you servicing the Racor filter just before the no fuel issue?

Search this site for "8V92 prime" you'll find information there.

Wanderlodge Owners Group > Mechanic's Corner > Engine > Detroit Diesel Tips and Modifications >

DETROIT DIESEL CHECKING FUEL PRESSURE.pdf
How to check the fuel pressure on a Detroit Diesel by Curt Springer. This could be adapted to almost any Diesel engine equipped with a fuel filter, with some modifications.
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  #5  
Old 04-08-2010
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Ed Wimberley Ed Wimberley is offline
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Harold
Just as Curt says will not be another fuel pump unless added by someone.
6&8V's don't really need one.I think another pump is added to reprime fuel lines when filters are changed, may make it cleaner.
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  #6  
Old 04-08-2010
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KERLEY KERLEY is offline
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Default Fuel pump

My 6V has a mechanical pump that is very visible on the back of the motor. Fuel is sucked from the tank through a Raycor filter and then a 30 micron spin on filter. Then it goes to the pump. Once it is there it goes through a 5 micron spin on filter and tee's to either head on the engine. I changed my pump when we put new heads on it. They are a very high flow low pressure pump; there is no need for an additional pump. I don't remember the spec as to how many gallons they pump per hour but it is crazy compared to traditional 4-stroke engines. That is why condensation can be a problem due to fuel heating.

So you are only getting fuel to one head or no fuel at either one?
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  #7  
Old 04-09-2010
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Quote:
Originally Posted by hltsystems View Post
Ed, thanks for the reply. No fuel pressure guage, other than that, it is setup as you describe. Is there an electric fuel pump located near the fuel tank? I noted posts conerning the FC series that describe a "Fasco" pump located by the tank (in the FC the tank would be in the rear instead of the middle of the coach). I cannot see the engine pump drawing the fuel all way from the tank located 25' away and then recirculating it through the injector system and eventually returning some back to the tank...but I do not have any documentation except the BB book and it does not cover this problem.
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Originally Posted by curtsprenger View Post
Harold...read the site rules and set up you signature before the forum moderators remind you.


Good Morning Harold,

Here is what Curt is reffering to;

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Originally Posted by iamflagman View Post
Please add your permanent signature.

You need to add a permanent signature to your user profile, so that it will automatically be added at the end of all of your posts, this way we will know who we are replying to and what year and model of 'Bird or RV that you own, or if you are a Wannabe 'Bird owner, that way you help us, so that we can better help you.

This was one of the things that you were asked to do in the Wanderlodge Owners Group Rules and that you agreed to, when you became a member of this forum;



To find out how to add a permanent signature to your profile please read;

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Thanks,
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  #8  
Old 04-09-2010
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Default 6V fuel pump

Quote:
Originally Posted by KERLEY View Post
My 6V has a mechanical pump that is very visible on the back of the motor. Fuel is sucked from the tank through a Raycor filter and then a 30 micron spin on filter. Then it goes to the pump. Once it is there it goes through a 5 micron spin on filter and tee's to either head on the engine. I changed my pump when we put new heads on it. They are a very high flow low pressure pump; there is no need for an additional pump. I don't remember the spec as to how many gallons they pump per hour but it is crazy compared to traditional 4-stroke engines. That is why condensation can be a problem due to fuel heating.

So you are only getting fuel to one head or no fuel at either one?
Here is a picture of the little pump; sorry its a little dark. The copper line is the suction. Have you checked your Raycor filter? Any little air leak will not let it prime and pull fuel. There also can be a check valve in the system to help hold the fuel in place. I had a ton of fuel problems with my bus when I bought it; so I had to learn all about it the hard way.

I have the service manual on cd for the 92 series engines. The fuel section is 158 MB and is a .pdf format. It shows diagrams, exploded views, pump service instructions, etc; I can try to send it to you somehow; little big for email; if you wish.
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  #9  
Old 04-10-2010
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iamflagman iamflagman is offline
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Quote:
Originally Posted by KERLEY View Post
I have the service manual on cd for the 92 series engines. The fuel section is 158 MB and is a .pdf format. It shows diagrams, exploded views, pump service instructions, etc; I can try to send it to you somehow; little big for email; if you wish.
Marc,

If you could burn me a new disc copy and then send it to me by snail mail, I will enter that information into the forum Database, then it can be directly accessed from there, by the membership.

Send it to;

John Finn
PO Box 161
Hopkins, SC
29061


Thanks,
__________________

JOHN FINN
FORUM MODERATOR-ADMINISTRATOR
1982 FC35RB
I'm NO EXPERT, but I did stay in the FINN'S INN EXPRESS last night
HOPKINS, SOUTH CAROLINA
VISIT THE FINN'S INN EXPRESS REMODELING ADVENTURE AND TECH. TIPS
I'M SO SLOW ON THE HILLS,THAT I GET TO SMELL THE FLOWERS AS I GO BY.....AND WATCH THEM GROW TOO!! NOT SO MUCH ANYMORE
Visit the WILD HARE RACING website
REMEMBER 9/11
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  #10  
Old 04-11-2010
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KERLEY KERLEY is offline
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Default 92 Series Disc

Quote:
Originally Posted by iamflagman View Post
Marc,

If you could burn me a new disc copy and then send it to me by snail mail, I will enter that information into the forum Database, then it can be directly accessed from there, by the membership.

Send it to;

John Finn
PO Box 161
Hopkins, SC
29061


Thanks,

I will send it out tomorrow.

Marc
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83 PT-40

2007 Jeep Wrangler 4-door
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