Parallelling fuel pumps
 

The plastic shell is capped at both ends. Pry off the caps and the
shell falls apart, exposing the pump inside.
I am presently trying to contact Walbro about the fuel pass thru
question. The info I have to date from the mfg. is the following:
Model 6802, continuous duty (10k+ hrs) electronic fuel pump, 420
micron mesh filter, magnetic filter, 7psi, 40gph. Everyone I have
spoken to to date states that the engine pump should be able to suck
fuel through a non operational Walbro, but I have not received an
answer yet from a specific engineering source.

On Tue, 13 Apr 2004 08:56:24 -0400, "Doug Dotson"
wrote:

Both my WALBRO pumps came with no replacement filters. A
large box in bold print in the instructions states the following:

" SERVICE DATA
The Walbro Marine Electronic Pump incorporates
two (2) built-in filters, one for filtering fine particles
and the other (a magnet) for trapping metalic
particles. Due to the construction of the protective
outer shell, these filters cannot be serviced."

The plastic outer shell appears to be glued together.
Perhaps this is a newer or different model than the
one you have.

Doug
s/v Callista

:
"Marc" wrote in message
.. .
The internal filter on the Walbro can be cleaned. In fact, they supply
a spare with the pump. Taking the pump apart is a little fussy in an
emergency situation. I am a little concerned to find out that a pump
failure may result in a blocked fuel supply due to the wobble plate.
Right now, I have the Walbro in line with my mechanical pump.


On Mon, 12 Apr 2004 17:55:34 -0400, "Doug Dotson"
wrote:

I seem to recall from the WALBRO docs that the pump is not
field servicable. Specifically, it states that the internal filters
cannot be changed.

Doug
s/v Callista

"Kelton Joyner" wrote in message
. ..
Unless you have isolation valves to allow servicing of a parallel pump,
series works just as well for backup.
fuel wil flow through the unpowered pump.
Kelton
W4IND
s/v Isle Escape

Larry W4CSC wrote:
(Steven Shelikoff) wrote in
:


That begs the question why are you going to put two pumps in parallel
if
you only want to run one at a time?

Steve



Backup?

Larry W4CSC

Parallelling fuel pumps
 

Well, my engine pump has been drawing fuel through a
Wabro for over a year now with no I'll effects.

Doug
s/v Callista

"Marc" wrote in message
...
The plastic shell is capped at both ends. Pry off the caps and the
shell falls apart, exposing the pump inside.
I am presently trying to contact Walbro about the fuel pass thru
question. The info I have to date from the mfg. is the following:
Model 6802, continuous duty (10k+ hrs) electronic fuel pump, 420
micron mesh filter, magnetic filter, 7psi, 40gph. Everyone I have
spoken to to date states that the engine pump should be able to suck
fuel through a non operational Walbro, but I have not received an
answer yet from a specific engineering source.

On Tue, 13 Apr 2004 08:56:24 -0400, "Doug Dotson"
wrote:

Both my WALBRO pumps came with no replacement filters. A
large box in bold print in the instructions states the following:

" SERVICE DATA
The Walbro Marine Electronic Pump incorporates
two (2) built-in filters, one for filtering fine particles
and the other (a magnet) for trapping metalic
particles. Due to the construction of the protective
outer shell, these filters cannot be serviced."

The plastic outer shell appears to be glued together.
Perhaps this is a newer or different model than the
one you have.

Doug
s/v Callista

:
"Marc" wrote in message
.. .
The internal filter on the Walbro can be cleaned. In fact, they supply
a spare with the pump. Taking the pump apart is a little fussy in an
emergency situation. I am a little concerned to find out that a pump
failure may result in a blocked fuel supply due to the wobble plate.
Right now, I have the Walbro in line with my mechanical pump.


On Mon, 12 Apr 2004 17:55:34 -0400, "Doug Dotson"
wrote:

I seem to recall from the WALBRO docs that the pump is not
field servicable. Specifically, it states that the internal filters
cannot be changed.

Doug
s/v Callista

"Kelton Joyner" wrote in message
. ..
Unless you have isolation valves to allow servicing of a parallel
pump,
series works just as well for backup.
fuel wil flow through the unpowered pump.
Kelton
W4IND
s/v Isle Escape

Larry W4CSC wrote:
(Steven Shelikoff) wrote in
:


That begs the question why are you going to put two pumps in
parallel
if
you only want to run one at a time?

Steve



Backup?

Larry W4CSC

Parallelling fuel pumps
 

Well, my engine pump has been drawing fuel through a
Wabro for over a year now with no I'll effects.

Doug
s/v Callista

"Marc" wrote in message
...
The plastic shell is capped at both ends. Pry off the caps and the
shell falls apart, exposing the pump inside.
I am presently trying to contact Walbro about the fuel pass thru
question. The info I have to date from the mfg. is the following:
Model 6802, continuous duty (10k+ hrs) electronic fuel pump, 420
micron mesh filter, magnetic filter, 7psi, 40gph. Everyone I have
spoken to to date states that the engine pump should be able to suck
fuel through a non operational Walbro, but I have not received an
answer yet from a specific engineering source.

On Tue, 13 Apr 2004 08:56:24 -0400, "Doug Dotson"
wrote:

Both my WALBRO pumps came with no replacement filters. A
large box in bold print in the instructions states the following:

" SERVICE DATA
The Walbro Marine Electronic Pump incorporates
two (2) built-in filters, one for filtering fine particles
and the other (a magnet) for trapping metalic
particles. Due to the construction of the protective
outer shell, these filters cannot be serviced."

The plastic outer shell appears to be glued together.
Perhaps this is a newer or different model than the
one you have.

Doug
s/v Callista

:
"Marc" wrote in message
.. .
The internal filter on the Walbro can be cleaned. In fact, they supply
a spare with the pump. Taking the pump apart is a little fussy in an
emergency situation. I am a little concerned to find out that a pump
failure may result in a blocked fuel supply due to the wobble plate.
Right now, I have the Walbro in line with my mechanical pump.


On Mon, 12 Apr 2004 17:55:34 -0400, "Doug Dotson"
wrote:

I seem to recall from the WALBRO docs that the pump is not
field servicable. Specifically, it states that the internal filters
cannot be changed.

Doug
s/v Callista

"Kelton Joyner" wrote in message
. ..
Unless you have isolation valves to allow servicing of a parallel
pump,
series works just as well for backup.
fuel wil flow through the unpowered pump.
Kelton
W4IND
s/v Isle Escape

Larry W4CSC wrote:
(Steven Shelikoff) wrote in
:


That begs the question why are you going to put two pumps in
parallel
if
you only want to run one at a time?

Steve



Backup?

Larry W4CSC

Parallelling fuel pumps
 

That is my concern. I think I will install both check valves
and isolation valves as well.

Doug
s/v Callista

"Steven Shelikoff" wrote in message
...
On Mon, 12 Apr 2004 13:33:26 -0000, Larry W4CSC wrote:

(Steven Shelikoff) wrote in
:


That begs the question why are you going to put two pumps in parallel
if
you only want to run one at a time?

Steve


Backup?

Then I wouldn't put them in parallel without isolation valves. Even if
it works when both pumps are good, you don't know how the pump will
fail.

Steve

Parallelling fuel pumps
 

That is my concern. I think I will install both check valves
and isolation valves as well.

Doug
s/v Callista

"Steven Shelikoff" wrote in message
...
On Mon, 12 Apr 2004 13:33:26 -0000, Larry W4CSC wrote:

(Steven Shelikoff) wrote in
:


That begs the question why are you going to put two pumps in parallel
if
you only want to run one at a time?

Steve


Backup?

Then I wouldn't put them in parallel without isolation valves. Even if
it works when both pumps are good, you don't know how the pump will
fail.

Steve

Parallelling fuel pumps
 

Further thoughts against paralleling such pumps:
If the internal check valves in one pump fails then the fluid will
flow retrograde in the pump that failed.... and damn little volume is
pumped by the pump that remains intact.
Typical industrial installation of such a 'system' would require a
block and bypass system of cocks/valves and bypass/lock-out piping.

In article , Steven Shelikoff
wrote:

On Mon, 12 Apr 2004 13:33:26 -0000, Larry W4CSC wrote:

(Steven Shelikoff) wrote in
:


That begs the question why are you going to put two pumps in parallel if
you only want to run one at a time?

Steve


Backup?

Then I wouldn't put them in parallel without isolation valves. Even if
it works when both pumps are good, you don't know how the pump will
fail.

Steve

Parallelling fuel pumps
 

Further thoughts against paralleling such pumps:
If the internal check valves in one pump fails then the fluid will
flow retrograde in the pump that failed.... and damn little volume is
pumped by the pump that remains intact.
Typical industrial installation of such a 'system' would require a
block and bypass system of cocks/valves and bypass/lock-out piping.

In article , Steven Shelikoff
wrote:

On Mon, 12 Apr 2004 13:33:26 -0000, Larry W4CSC wrote:

(Steven Shelikoff) wrote in
:


That begs the question why are you going to put two pumps in parallel if
you only want to run one at a time?

Steve


Backup?

Then I wouldn't put them in parallel without isolation valves. Even if
it works when both pumps are good, you don't know how the pump will
fail.

Steve

Parallelling fuel pumps
 

Dont need check valves if you install isolation valves.

In article , Doug Dotson
wrote:

That is my concern. I think I will install both check valves
and isolation valves as well.

Doug
s/v Callista

"Steven Shelikoff" wrote in message
...
On Mon, 12 Apr 2004 13:33:26 -0000, Larry W4CSC wrote:

(Steven Shelikoff) wrote in
:


That begs the question why are you going to put two pumps in parallel
if
you only want to run one at a time?

Steve


Backup?

Then I wouldn't put them in parallel without isolation valves. Even if
it works when both pumps are good, you don't know how the pump will
fail.

Steve

Parallelling fuel pumps
 

Dont need check valves if you install isolation valves.

In article , Doug Dotson
wrote:

That is my concern. I think I will install both check valves
and isolation valves as well.

Doug
s/v Callista

"Steven Shelikoff" wrote in message
...
On Mon, 12 Apr 2004 13:33:26 -0000, Larry W4CSC wrote:

(Steven Shelikoff) wrote in
:


That begs the question why are you going to put two pumps in parallel
if
you only want to run one at a time?

Steve


Backup?

Then I wouldn't put them in parallel without isolation valves. Even if
it works when both pumps are good, you don't know how the pump will
fail.

Steve

Parallelling fuel pumps
 

Must be a 'new' version as all my Walbro pumps have
accessible/removalbe/cleanable protection screens/strainer wire.

In article , Doug Dotson
wrote:

Both my WALBRO pumps came with no replacement filters. A
large box in bold print in the instructions states the following:

" SERVICE DATA
The Walbro Marine Electronic Pump incorporates
two (2) built-in filters, one for filtering fine particles
and the other (a magnet) for trapping metalic
particles. Due to the construction of the protective
outer shell, these filters cannot be serviced."

The plastic outer shell appears to be glued together.
Perhaps this is a newer or different model than the
one you have.

Doug
s/v Callista

:
"Marc" wrote in message
...
The internal filter on the Walbro can be cleaned. In fact, they supply
a spare with the pump. Taking the pump apart is a little fussy in an
emergency situation. I am a little concerned to find out that a pump
failure may result in a blocked fuel supply due to the wobble plate.
Right now, I have the Walbro in line with my mechanical pump.


On Mon, 12 Apr 2004 17:55:34 -0400, "Doug Dotson"
wrote:

I seem to recall from the WALBRO docs that the pump is not
field servicable. Specifically, it states that the internal filters
cannot be changed.

Doug
s/v Callista

"Kelton Joyner" wrote in message
. ..
Unless you have isolation valves to allow servicing of a parallel pump,
series works just as well for backup.
fuel wil flow through the unpowered pump.
Kelton
W4IND
s/v Isle Escape

Larry W4CSC wrote:
(Steven Shelikoff) wrote in
:


That begs the question why are you going to put two pumps in parallel
if
you only want to run one at a time?

Steve



Backup?

Larry W4CSC