Diesel leak in lower compartment

[timvasqz]

EricP, is there is a pony pump to lift the fuel to the injector
pump??? it could be that a bad check valve is the problem, causing
pump failure????? pump may be result, not cause

the Aquahot did start out with a Wabasto burner. at the burner,
diesel fuel is pressurized to over 1200psi. there is a selonoid
valve on the exhaust side of the injector pump to assure the fuel
spray at the injector doesnt dribble. A sequence in the control
module runs the ipump up to build the pressure prior to an open to
spray command. When the electric selonoid spray valve fails you get
dieselfuel smell at the burner when it is turned off because the
pressure captured after ipump is dribbled out the nozzle. That often
will also prove white smoke burn off once the burner refires .

If the ipump pressure is making its way back to the supply path of
fuel, it could do a couple of things. One is blow the check valve in
the pony/lift pump (if there is one)the other is cause a fine 1200
psi spray in the supply path where there are hose clamps. the supply
to the aquahot may have a checkvalve in the tank pickup tube which
will keep any wrong way pressure from being relieved by pissing back
in the tank.

the same situation could happen if the lift/pony pump has a backflow
issue even independent of the ipump. ( but a failed backflow in the
ipump would blow the ponypump dynamic and may even overcome a
functioning pony backflow) the pony pump if any doesnt need to make
any more than 10 psi. its not pressure that a pony pump provides, its
job is volumn and maintained delivery.
Greg ofTim&Greg
94ptca

--- In WanderlodgeForum@yahoogroups.com, "Eric Perplies"
wrote:
>
> The 1996 Aquahot units had a problem with the fuel pump. The fuel
> pumps leaked fuel. There was some sort of recall a decade ago in
> which Vehicle Systems (the owner of Aquahot) provided labor and
> material to replace the fuel pump. That time has lapsed.
>
> Remove the cover from the left side of the Aquahot (a milk run).
See
> if you have fuel on the pan under the burner. If you do have diesel
> there you could have a leaking fuel pump or of course a diesel leak
> elsewhere. I would clean the fuel pump up with a spray
> solvent/cleaner then come back the next day and inspect things.
>
> Note: If the leak is in your Aquahot I would really recommend your
> trying to fix it yourself. The Aquahot is very easy to maintain and
> has an outstanding manual available. The manual will show you the
> location of the fuel pump.
>
> Eric Perplies
> 96 42 WBWL
> currently in Fredericksburg, TX
>