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79 928 fuel system..

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Old 03-18-2017, 06:41 PM   #1
Speedtoys
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Default 79 928 fuel system..

Can you use the filter/pump from an S3-S4 on this car?
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Old 03-18-2017, 11:21 PM   #2
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The CIS fuel system uses a higher pressure pump than later models.
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Old 03-18-2017, 11:39 PM   #3
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I think someone's been using an S4 pump in Saudi Arabia in place of both pumps without any issues. Forgot his username. He posts a great deal, so I'm sure he will chime in.

Hoi
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Old 03-19-2017, 08:49 AM   #4
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I ran a CIS car using the later tank and pump set up for quite some time. The CiS pump has a built in check valve while it is in the banjo on later pumps so be sure to address that issue when trying this. It's possible but less than optimal
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Old 03-20-2017, 07:54 PM   #5
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CIS needs to see a system pressure of 5+Bar (75 Psi+),So you need a pump with that pressure rating.
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Old 03-20-2017, 10:27 PM   #6
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Quote:
Originally Posted by STRIKEMASTER View Post
CIS needs to see a system pressure of 5+Bar (75 Psi+),So you need a pump with that pressure rating.
Good to know, totally new system to me.

Its a car with some work done to the fuel system in the rear..that could end up in an S3 config, or back to 79 config...for about the same price I think.

I already have in the parts the came with it, an S3 pump/filter/mounting hardware.

Gotta drop the tank and see what's really all going on.
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Old 03-21-2017, 01:43 PM   #7
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The filters are the same apart from a screw in connector on one end of the filter - remove the screw in connector and you are good to go on the filter.
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