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Join Date: Sep 2009
Posts: 57
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Porsche 924 fuel check valve
Hello All,
I noticed that a 924 turbo has an check valve that screw in to a regular fitting unlike a banjo bolt. Do you think it would work on a bosch fuel pump? I have a 911 2.7 that does not have a fuel check valve. The fuel pump must of been updated and one never installed? I do not want to run new lines etc. looking for a simple fix and it looks like the 924 may work see pic . Any thoughts 
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05-15-2016, 04:37 PM
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Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,480
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The 77 2.7 has a check valve built into the fuel pump. That ran through 79 production.
A banjo fitting comes off the end of the pump into the main fuel galley. There doesn't look like there is enough room on your part for a banjo fitting. The 80 to 83 had a bolt on check valve but as I recall the banjo of the fuel galley is a different size than the 77/79 . Bruce |
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05-15-2016, 05:13 PM
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Posts: 57
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HI Thanks for the reply
The car is a 75 911 s? It indicated it had an external fuel check valve. Do you think I can bolt the 924 one directly inline with the regular gas line fitting ? |
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05-15-2016, 07:07 PM
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Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,480
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The 75 has pump in the left rear quarter
The banjo part is the check valve off the side of the pump. 91160890100 Bruce Last edited by Flat6pac; 05-16-2016 at 01:52 AM.. |
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05-16-2016, 01:50 AM
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Posts: 57
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re Check valve
Thank you very much for the reply. The issue is that the pump on the car is upgraded its no longer the 75 fuel pump. I believe that car had a fuel pump with a check valve built into the pump looking to add a check valve from a 924 turbo so I dont need ot change the line ? WOndering if it would work
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05-16-2016, 01:35 PM
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Join Date: May 2004
Location: New Hampshire
Posts: 6,136
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 If the thread size (typically M12x1.5) matches and you have the correct Female hose fitting and room to route the hose then it should work. Most replacement fuel pumps have the outlet at the end, not the side. A banjo is used so it takes up less room where it is mounted. Perhaps you can post a photo of your pump in place and we can all make suggestions. Usually there is more than one way to skin a cat. Len
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06-10-2016, 07:48 AM
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Join Date: May 2004
Location: Boulder, Colorado
Posts: 7,275
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Indeed. One very crude way is to install a normally open switch (a momentary push button)in some convenient location so the driver can push it, and wire it to the fuel pump relay so when you turn the ignition to ON you can push the button to run the fuel pump for a couple of seconds. This will pressurize the system promptly, and you can then engage the starter.
My SC came as a '77 2.7, so it has the smaller banjo end on the front of the fuel line where it has to attach to the pump. I bought an aftermarket pump for a 3.0 or 3.2 (a Bosch 044 equivalent), which works fine but I had a heck of a time plumbing things so that I had a check valve, because the ones which screw in all seemed to have a larger diameter on the output side where the banjo has to fit. The banjo fitting (sans CV) from the old setup screwed into the new pump, so the plumbing was simple. I've since changed things - don't quite recall what I did, but watching the system pressure when fiddling with the CIS tells me I easily meet the pressure retention spec. |
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06-19-2016, 09:46 PM
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