Is it possible/advisable to place 2 WALBRO fuel pumps
in parallel without any valves? My goal is to be able
to switch between pumps by just applying power to one
or the other without having to adjust valves.

Doug
s/v Callista

"Doug Dotson" wrote in message
...
Is it possible/advisable to place 2 WALBRO fuel pumps
in parallel without any valves? My goal is to be able
to switch between pumps by just applying power to one
or the other without having to adjust valves.


I'm not familiar with the WALBRO pumps, but I would assume that they are
positive displacement pumps and therefore would have valves that would act
as check valves.

However, I would recommend inline check valves in the discharge of each to
keep the service pressure off these valves and the pump chamber. No sense
subjecting the idle pump to service pressure if unnecassary.

I'm preparing to install a lift pump in series with my engine pump to assist
in priming both the engine and the generator after I change filters.
Unfortunately the pump I purchased (AC) can only lift 1 ft., according to
the specs. Tha't ridiculous IMHO... My tanks are all down in the keels and
the lift for my service/day tank would be about 30 inches when the tank is
low. Sorry, didn't mean to bring my problems into your post.

Steve
s/v Good Intentions

Hi Steve,

I'd just return that pump and get one that will do better. I thought that
installing check valves as you suggest might be a good idea.

Doug
s/v Callista

"Steve" wrote in message
...

"Doug Dotson" wrote in message
...
Is it possible/advisable to place 2 WALBRO fuel pumps
in parallel without any valves? My goal is to be able
to switch between pumps by just applying power to one
or the other without having to adjust valves.


I'm not familiar with the WALBRO pumps, but I would assume that they are
positive displacement pumps and therefore would have valves that would act
as check valves.

However, I would recommend inline check valves in the discharge of each to
keep the service pressure off these valves and the pump chamber. No sense
subjecting the idle pump to service pressure if unnecassary.

I'm preparing to install a lift pump in series with my engine pump to
assist
in priming both the engine and the generator after I change filters.
Unfortunately the pump I purchased (AC) can only lift 1 ft., according to
the specs. Tha't ridiculous IMHO... My tanks are all down in the keels and
the lift for my service/day tank would be about 30 inches when the tank is
low. Sorry, didn't mean to bring my problems into your post.

Steve
s/v Good Intentions

Hi Steve,

I'd just return that pump and get one that will do better. I thought that
installing check valves as you suggest might be a good idea.

Doug
s/v Callista

"Steve" wrote in message
...

"Doug Dotson" wrote in message
...
Is it possible/advisable to place 2 WALBRO fuel pumps
in parallel without any valves? My goal is to be able
to switch between pumps by just applying power to one
or the other without having to adjust valves.


I'm not familiar with the WALBRO pumps, but I would assume that they are
positive displacement pumps and therefore would have valves that would act
as check valves.

However, I would recommend inline check valves in the discharge of each to
keep the service pressure off these valves and the pump chamber. No sense
subjecting the idle pump to service pressure if unnecassary.

I'm preparing to install a lift pump in series with my engine pump to
assist
in priming both the engine and the generator after I change filters.
Unfortunately the pump I purchased (AC) can only lift 1 ft., according to
the specs. Tha't ridiculous IMHO... My tanks are all down in the keels and
the lift for my service/day tank would be about 30 inches when the tank is
low. Sorry, didn't mean to bring my problems into your post.

Steve
s/v Good Intentions

Steve,

I may have misunderstood you comment about limited lift. Why not install the
pump close to the tank so that the vertical suction run (lift) is as short
as possible? The pump will have lots of head to deliver to the engine.

surfnturf


"Steve" wrote in message
...

snip
I'm preparing to install a lift pump in series with my engine pump to
assist
in priming both the engine and the generator after I change filters.
Unfortunately the pump I purchased (AC) can only lift 1 ft., according to
the specs. Tha't ridiculous IMHO... My tanks are all down in the keels and
the lift for my service/day tank would be about 30 inches when the tank is
low. Sorry, didn't mean to bring my problems into your post.

Steve
s/v Good Intentions

"surfnturf" wrote in message
news:Oqyec.90907$Ig.50300@pd7tw2no...

pump close to the tank so that the vertical suction run (lift) is as short
as possible? The pump will have lots of head to deliver to the engine.


From the top of the tank to the bottom is about 24", so even if I put the
pump on the tank top (not desireable since that is the bilge. Tanks are
integral.) the suction life, when the tank is low, would be more than the 1
ft spec. Might work fine as long as I don't loose suction. However the whole
idea is to have it as a priming pump.

Steve
s/v Good Intentions

Got it now. Was thinking about bottom discharge, or even monting pump on
same elevation as the bottom of the tank.

surfnturf

"Steve" wrote in message
From the top of the tank to the bottom is about 24", so even if I put the
pump on the tank top (not desireable since that is the bilge. Tanks are
integral.) the suction life, when the tank is low, would be more than the
1
ft spec. Might work fine as long as I don't loose suction. However the
whole
idea is to have it as a priming pump.

Steve
s/v Good Intentions

Got it now. Was thinking about bottom discharge, or even monting pump on
same elevation as the bottom of the tank.

surfnturf

"Steve" wrote in message
From the top of the tank to the bottom is about 24", so even if I put the
pump on the tank top (not desireable since that is the bilge. Tanks are
integral.) the suction life, when the tank is low, would be more than the
1
ft spec. Might work fine as long as I don't loose suction. However the
whole
idea is to have it as a priming pump.

Steve
s/v Good Intentions

"surfnturf" wrote in message
news:Oqyec.90907$Ig.50300@pd7tw2no...

pump close to the tank so that the vertical suction run (lift) is as short
as possible? The pump will have lots of head to deliver to the engine.


From the top of the tank to the bottom is about 24", so even if I put the
pump on the tank top (not desireable since that is the bilge. Tanks are
integral.) the suction life, when the tank is low, would be more than the 1
ft spec. Might work fine as long as I don't loose suction. However the whole
idea is to have it as a priming pump.

Steve
s/v Good Intentions

Steve,

I may have misunderstood you comment about limited lift. Why not install the
pump close to the tank so that the vertical suction run (lift) is as short
as possible? The pump will have lots of head to deliver to the engine.

surfnturf


"Steve" wrote in message
...

snip
I'm preparing to install a lift pump in series with my engine pump to
assist
in priming both the engine and the generator after I change filters.
Unfortunately the pump I purchased (AC) can only lift 1 ft., according to
the specs. Tha't ridiculous IMHO... My tanks are all down in the keels and
the lift for my service/day tank would be about 30 inches when the tank is
low. Sorry, didn't mean to bring my problems into your post.

Steve
s/v Good Intentions