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#1
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Parallelling fuel pumps
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 |
#2
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Parallelling fuel pumps
"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 |
#3
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Parallelling fuel pumps
"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 |
#4
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Parallelling fuel pumps
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 |
#5
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Parallelling fuel pumps
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 |
#6
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Parallelling fuel pumps
On Sun, 11 Apr 2004 21:57:42 -0400, "Doug Dotson"
wrote: 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. 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 |
#7
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Parallelling fuel pumps
On Sun, 11 Apr 2004 21:57:42 -0400, "Doug Dotson"
wrote: 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. 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 |
#10
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Parallelling fuel pumps
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 |
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