8V92 Low Fuel Pressure

[Curt Sprenger]

I changed seven fuel lines...4 at the heads, Racor to fuel pump, fuel
pump to filter inlet, return manifold to hard return line.

After priming/starting the 8V92...Fuel Pressure readings were 8 at idle,
45 at 2150 rpms. Ran the engine for a few minutes. Fuel pressure now 2
at idle, 30 at 2150 rpms. The manual says 20 to 30 at idle, 50 to 70 at
2150 rpms.

A new fuel pump was installed. Same low pressures as above.

Removed the pressure relief plug, gasket, pin, spring, relief valve,
from the *old* pump. All looks good, nothing stuck.

My error, I did not take fuel pressure readings before the hose change,
problem could have been there before.

Thoughts?

--
Curt Sprenger
1987 PT38 8V92 "MacAttack Racing"
Anaheim Hills, Calif.

[davidkerryedwards]

I know Mercedes diesels can get dirty screens in the fuel tank. Don't know if
this could
happen in your case. Have you checked the flow out of the tank?

Kerry
82 FC 35
Denver

--- In WanderlodgeForum@yahoogroups.com, Curt Sprenger wrote:
>
> I changed seven fuel lines...4 at the heads, Racor to fuel pump, fuel
> pump to filter inlet, return manifold to hard return line.
>
> After priming/starting the 8V92...Fuel Pressure readings were 8 at idle,
> 45 at 2150 rpms. Ran the engine for a few minutes. Fuel pressure now 2
> at idle, 30 at 2150 rpms. The manual says 20 to 30 at idle, 50 to 70 at
> 2150 rpms.
>
> A new fuel pump was installed. Same low pressures as above.
>
> Removed the pressure relief plug, gasket, pin, spring, relief valve,
> from the *old* pump. All looks good, nothing stuck.
>
> My error, I did not take fuel pressure readings before the hose change,
> problem could have been there before.
>
> Thoughts?
>
> --
> Curt Sprenger
> 1987 PT38 8V92 "MacAttack Racing"
> Anaheim Hills, Calif.
>

[tjholtermann]

Curt,

Reply off line, at tjholtermann@.... I need to ask you some
questions, I think I help you with your problem.

Tony Holtermann
88wb38 San Marcos, Tx.

--- In WanderlodgeForum@yahoogroups.com, Curt Sprenger
wrote:
>
> I changed seven fuel lines...4 at the heads, Racor to fuel pump,
fuel
> pump to filter inlet, return manifold to hard return line.
>
> After priming/starting the 8V92...Fuel Pressure readings were 8 at
idle,
> 45 at 2150 rpms. Ran the engine for a few minutes. Fuel pressure
now 2
> at idle, 30 at 2150 rpms. The manual says 20 to 30 at idle, 50 to
70 at
> 2150 rpms.
>
> A new fuel pump was installed. Same low pressures as above.
>
> Removed the pressure relief plug, gasket, pin, spring, relief
valve,
> from the *old* pump. All looks good, nothing stuck.
>
> My error, I did not take fuel pressure readings before the hose
change,
> problem could have been there before.
>
> Thoughts?
>
> --
> Curt Sprenger
> 1987 PT38 8V92 "MacAttack Racing"
> Anaheim Hills, Calif.
>

[davidkerryedwards]

I should have added that you can test the tank by simply taking a gallon
container of diesel
and putting your suction and return lines into it and try running the engine off
the container.
It would exclude any problems upstream of your attachment point to the tank.

Kerry
82 FC 35
Denver

--- In WanderlodgeForum@yahoogroups.com, "davidkerryedwards"
wrote:
>
> I know Mercedes diesels can get dirty screens in the fuel tank. Don't know if
this could
> happen in your case. Have you checked the flow out of the tank?
>
> Kerry
> 82 FC 35
> Denver

[Troy Tikalsky]

Have you verified the gauge is reading correctly?

Troy


----- Original Message -----
From: Curt Sprenger
To: WanderlodgeForum@yahoogroups.com ; wanderlodge@yahoogroups.com
Sent: Sunday, March 11, 2007 10:31 AM
Subject: [WanderlodgeForum] 8V92 Low Fuel Pressure


I changed seven fuel lines...4 at the heads, Racor to fuel pump, fuel
pump to filter inlet, return manifold to hard return line.

After priming/starting the 8V92...Fuel Pressure readings were 8 at idle,
45 at 2150 rpms. Ran the engine for a few minutes. Fuel pressure now 2
at idle, 30 at 2150 rpms. The manual says 20 to 30 at idle, 50 to 70 at
2150 rpms.

A new fuel pump was installed. Same low pressures as above.

Removed the pressure relief plug, gasket, pin, spring, relief valve,
from the *old* pump. All looks good, nothing stuck.

My error, I did not take fuel pressure readings before the hose change,
problem could have been there before.

Thoughts?

--
Curt Sprenger
1987 PT38 8V92 "MacAttack Racing"
Anaheim Hills, Calif.





[Non-text portions of this message have been removed]

[Curt Sprenger]

Yes.

Curt Sprenger
1987 PT38 8V92 "MacAttack Racing"
Anaheim Hills, Calif.



Troy Tikalsky wrote:

> Have you verified the gauge is reading correctly?
>
> Troy
>
> ----- Original Message -----
> From: Curt Sprenger
> To: WanderlodgeForum@yahoogroups.com
> ;
> wanderlodge@yahoogroups.com
> Sent: Sunday, March 11, 2007 10:31 AM
> Subject: [WanderlodgeForum] 8V92 Low Fuel Pressure
>
> I changed seven fuel lines...4 at the heads, Racor to fuel pump, fuel
> pump to filter inlet, return manifold to hard return line.
>
> After priming/starting the 8V92...Fuel Pressure readings were 8 at idle,
> 45 at 2150 rpms. Ran the engine for a few minutes. Fuel pressure now 2
> at idle, 30 at 2150 rpms. The manual says 20 to 30 at idle, 50 to 70 at
> 2150 rpms.
>
> A new fuel pump was installed. Same low pressures as above.
>
> Removed the pressure relief plug, gasket, pin, spring, relief valve,
> from the *old* pump. All looks good, nothing stuck.
>
> My error, I did not take fuel pressure readings before the hose change,
> problem could have been there before.
>
> Thoughts?
>
> --
> Curt Sprenger
> 1987 PT38 8V92 "MacAttack Racing"
> Anaheim Hills, Calif.
>
> [Non-text portions of this message have been removed]
>
>

[putneyflash@...>]

See if there is a check valvein the line if so it may need to be cleaned
re brake 1983 fc-35
>
> From: "tjholtermann"
> Date: 2007/03/11 Sun PM 01:07:45 EST
> To: WanderlodgeForum@yahoogroups.com
> Subject: [WanderlodgeForum] Re: 8V92 Low Fuel Pressure
>
> Curt,
>
> Reply off line, at tjholtermann@.... I need to ask you some
> questions, I think I help you with your problem.
>
> Tony Holtermann
> 88wb38 San Marcos, Tx.
>
> --- In WanderlodgeForum@yahoogroups.com, Curt Sprenger
> wrote:
> >
> > I changed seven fuel lines...4 at the heads, Racor to fuel pump,
> fuel
> > pump to filter inlet, return manifold to hard return line.
> >
> > After priming/starting the 8V92...Fuel Pressure readings were 8 at
> idle,
> > 45 at 2150 rpms. Ran the engine for a few minutes. Fuel pressure
> now 2
> > at idle, 30 at 2150 rpms. The manual says 20 to 30 at idle, 50 to
> 70 at
> > 2150 rpms.
> >
> > A new fuel pump was installed. Same low pressures as above.
> >
> > Removed the pressure relief plug, gasket, pin, spring, relief
> valve,
> > from the *old* pump. All looks good, nothing stuck.
> >
> > My error, I did not take fuel pressure readings before the hose
> change,
> > problem could have been there before.
> >
> > Thoughts?
> >
> > --
> > Curt Sprenger
> > 1987 PT38 8V92 "MacAttack Racing"
> > Anaheim Hills, Calif.
> >
>
>
>
>