| Home |
| Search |
| Today's Posts |
|
|
|
#1
|
|||
|
|||
Fuel transfer/polishing pump
Subject: Fuel transfer/polishing pump
From: Jere Lull You don't want too fine a filter on the suction side. On Yanmars (and others), the lift pump can fail sooner due to the restriction. My point is if you use a large surface area small micron filter and change it regularly, you should never see high suction pressures. The idea is to do the cleaning in stages: 30 micron before the lift pump, 10 micron just before the high pressure pump. That said, we used 10 micron Racor elements for 8-9 seasons and 1000 hours with no significant ill effects except when we got a shot of algae. 8-9 years without changing the element! Your perpetuating a stereo type Jere. :-) The on-engine filter never had any significant dirt on it (or in the bowl). That didn't change much when we went to 30 microns, as it happens. Note: We were able to limp home when the last filter on board clogged up during the algae incident: Pulled the filter and gently brushed junk off of the surface, and drained and cleaned the bowl (again). For a couple of hours, we could only pull half revs, but the fuel cleaned up nicely at reduced flow and (after draining the dead bodies from the bowl again) we had full power for the rest of the season. Yeah, been there, done that. Lots of fun when there's a sea running. Capt. Bill |
|
#2
|
|||
|
|||
|
Fuel transfer/polishing pump
LaBomba182 wrote:
Subject: Fuel transfer/polishing pump From: Jere Lull You don't want too fine a filter on the suction side. On Yanmars (and others), the lift pump can fail sooner due to the restriction. My point is if you use a large surface area small micron filter and change it regularly, you should never see high suction pressures. If you do both, it's better, of course. We balance cost in there someplace, of course. I figure a new 30-micron filter will have one third (or 1/9th?) the resistance, switching up to a 900 would only (about) halve it. When there's a bit of dirt, though, the 30 micron filter will clog less while still protecting the lift pump. The idea is to do the cleaning in stages: 30 micron before the lift pump, 10 micron just before the high pressure pump. That said, we used 10 micron Racor elements for 8-9 seasons and 1000 hours with no significant ill effects except when we got a shot of algae. 8-9 years without changing the element! Your perpetuating a stereo type Jere. :-) You're right, that wasn't entirely clear. We change the filters each spring as cheap insurance. I haven't noticed any discoloration in the primary filter or bowl except when I brushed the Racor during the algae incident, and that could well have been my mishandling. -- Jere Lull Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD) Xan's Pages: http://members.dca.net/jerelull/X-Main.html Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/ |
|
#3
|
|||
|
|||
|
Fuel transfer/polishing pump
Subject: Fuel transfer/polishing pump
From: Jere Lull I figure a new 30-micron filter will have one third (or 1/9th?) the resistance, switching up to a 900 would only (about) halve it. I would guess much less than that. Based on the surface area of a 900. You're right, that wasn't entirely clear. We change the filters each spring as cheap insurance. Got it. :-) Capt. Bill |
|
#4
|
|||
|
|||
|
Fuel transfer/polishing pump
Subject: Fuel transfer/polishing pump
From: Jere Lull I figure a new 30-micron filter will have one third (or 1/9th?) the resistance, switching up to a 900 would only (about) halve it. I would guess much less than that. Based on the surface area of a 900. You're right, that wasn't entirely clear. We change the filters each spring as cheap insurance. Got it. :-) Capt. Bill |
|
#5
|
|||
|
|||
|
Fuel transfer/polishing pump
LaBomba182 wrote:
Subject: Fuel transfer/polishing pump From: Jere Lull You don't want too fine a filter on the suction side. On Yanmars (and others), the lift pump can fail sooner due to the restriction. My point is if you use a large surface area small micron filter and change it regularly, you should never see high suction pressures. If you do both, it's better, of course. We balance cost in there someplace, of course. I figure a new 30-micron filter will have one third (or 1/9th?) the resistance, switching up to a 900 would only (about) halve it. When there's a bit of dirt, though, the 30 micron filter will clog less while still protecting the lift pump. The idea is to do the cleaning in stages: 30 micron before the lift pump, 10 micron just before the high pressure pump. That said, we used 10 micron Racor elements for 8-9 seasons and 1000 hours with no significant ill effects except when we got a shot of algae. 8-9 years without changing the element! Your perpetuating a stereo type Jere. :-) You're right, that wasn't entirely clear. We change the filters each spring as cheap insurance. I haven't noticed any discoloration in the primary filter or bowl except when I brushed the Racor during the algae incident, and that could well have been my mishandling. -- Jere Lull Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD) Xan's Pages: http://members.dca.net/jerelull/X-Main.html Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/ |
| Reply |
| Thread Tools | Search this Thread |
| Display Modes | |
|
|
Similar Threads
|
||||
| Thread | Forum | |||
| Problem changing out my fuel pump | General | |||
| Engine dies- Putters when trying to plane- engine under under heavy load | General | |||
| Can a single 72 gal per hour fuel pump run two 392 cu inch motors? | General | |||
| Inboard won't run above 2800 RPM | General | |||
| Fuel pump to carbs fuel line replacement | General | |||
Hybrid Mode
