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Join Date: Nov 2004
Location: Raleigh, NC
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Walbro Fuel Pump ???
Need to replace the pump for an 82 SC.
I did a search and there seems to be some postive feedback about the Walbro. Should I even bother or stick with the Bosch? Thanks !
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John D. 82 911 SC Targa-Rosewood 2012 Golf TDI |
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11-19-2007, 06:56 AM
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RETIRED
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They are fine....as long as it's rated for the same pressure.
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1983/3.6, backdate to long hood 2012 ML350 3.0 Turbo Diesel |
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11-19-2007, 07:01 AM
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Here are the specs.
Fuel Pump Specifications Walbro Part Number: GCL604 Minimum Current: 12 Volts Operating Pressure: 73 PSI Minimum Flow @ Outlet: 56 GPH High Pressure
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John D. 82 911 SC Targa-Rosewood 2012 Golf TDI |
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11-19-2007, 07:27 AM
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GAFB
Join Date: Dec 1999
Location: Raleigh, NC, USA
Posts: 7,842
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John,
I'm using a Walbro pump on my '76 911S. The car was purchased with 21 year-old fuel gumming up the pump, so I tossed it. I believe the Walbro model I purchased was the GSL392. So far I am very happy with it - quiet and reliable. Had to make a couple trips to the hardware store and use my imagination to get it all plumbed on the tank-to-pump side, but it was no big deal compared to the savings versus OEM Porsche.
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Several BMWs |
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11-19-2007, 09:08 AM
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Fuel Pump Capacity
Quote:
The capacity of the above fuel pump is well below the recommended flow rate for CIS (SC motors) at 2 liter per min (2.12 qt per min.). The 56 GPH is equivalent to 0.93 gal. per min. (0.23 qt/min) or 0.22 liter per min. Based from Bentley Manual's 'Fuel pump Delivery Volume' (Table b) delivery rate should be 1 liter per 30 second @ 12 volts. Hope this helps. Tony |
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11-19-2007, 12:39 PM
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Tony,
I'm confused The specs for the Bosch pump 0 580 254 053 is 175 litres per hour = 46.24 Gallons per hour. 1.46 liters over 30 second http://www.worldwidemetric.com/metcal.htm Walbro conversion 56 GPH = 211.92 LPH = 1.77 liter per 30 second
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John D. 82 911 SC Targa-Rosewood 2012 Golf TDI Last edited by GothingNC; 11-19-2007 at 12:54 PM.. |
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11-19-2007, 12:42 PM
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Check your math and metric conversions. That Walbro is flowing in-spec.
 Brian |
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11-19-2007, 12:53 PM
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Quote:
Oooops!!!! John your calculation is CORRECT!!!!!! I had my conversion factor in inversed order. Four decades away from school and limited practice is to blame (just kidding). Sorry for the confusion. Please accept my apologies. The pump should be OK. Tony |
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11-19-2007, 01:50 PM
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No problem Tony
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John D. 82 911 SC Targa-Rosewood 2012 Golf TDI |
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11-19-2007, 02:11 PM
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Not to hijack... looking at this post...
When I drive harder than normal, say, Denver up to 11,000 feet (the tunnel), my fuel pump buzzes. It doesn't make noise driving around town. Should I be thinking about replacing the pump? Don't want to get stranded. |
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11-19-2007, 03:27 PM
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Walbro Pump
A while back I recommended Pelican carry this item:
Walbro GCL604 In-Line Pump Kit It was a one for one, straight up swap in my '83 SC. Came with everything required to install. I've been running it since July '04 with no problems. It was significantly cheaper than the OEM Bosch unit; totally silent too. Poor picture but the Walbro is the shiny pump to the right. It fit inside of the insulated sleeve just above it. (made it the same diameter as the Bosch). It was a straight forward bolt up/wire up.  I highly recommend Pelican carry this item  .Good luck, Gordo
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Don "Gordo" Gordon '83 911SC Targa |
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11-19-2007, 04:38 PM
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Don,
The Wlabro pump in this photo looks similar to the Bosch sze. http://www.fuelpumps.com/19811983-porsche-911-sc-fuel-pump-6-cyl-30l-p-3149.html
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John D. 82 911 SC Targa-Rosewood 2012 Golf TDI |
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11-22-2007, 08:27 AM
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Obviously what Don did is working fine for him. My only word of caution is that many high output pumps go to the trouble of cast on cooling fins. Do we really want to insulate it? Sure at this level, the fuel may provide suficient cooling (though heating fuel is rarely good for vapor lock), but maybe a spacer that vents or circulates air might be a better choice. I'm certainly not passing judgement, just my thoughts.
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Luke S. 72 RS spirit 2.7mfi, 73 3.2 Hotrod on steelies, 76 993 3.3efi TT, 86 trackrat, 91 C4s widebody,02 OLA winning 6GT2, 07 997TT, 72 914 v8,03 900 rwhp 996TT |
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11-22-2007, 09:29 AM
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Join Date: May 2000
Location: Los Alamos, NM, USA
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Have you seen any Bosch roller cell (used in the Porsche CIS systems) fuel pumps with integral cooling fins? All the units I've ever seen have a smooth outer shell and are designed to be cooled by the fuel passing through them. After 1974 the the majority of the Porsche CIS fuel pumps were located above the front splash guard where the air circulation is minimal so I really doubt they were designed or specified with any air cooling in mind. We've been running a Walbro pump in relatively poor suction head conditions (1973.5 rear mounted pump position, summer heat, foam sleeve over the pump body and an additional fuel filter on the suction side) without problems.
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11-22-2007, 09:31 PM
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Da cab
