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930s rule the wasteland
 
h20cooled7's Avatar
 
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fuel pump ?

does the rear fuel pump on 930 have check valvle or just the front pump?
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Old 07-08-2018, 11:49 AM
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The rear pump has an internal check valve( according to the Bosch spec sheet) and the front pump has an external check valve.
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Old 07-09-2018, 01:01 PM
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Mine has an external check valve/fitting. I believe it was on the forward end or the inlet side of the pump.
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Old 07-09-2018, 02:07 PM
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If internal check valve goes bad will you know it or will the front just hold pressure? im just trying to zero in on a hot start issue. Thanks for response!
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1980 930 Turbo
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1984 944
2001 VW golf TDI
Old 07-15-2018, 03:19 AM
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If the front pump check valve that is on the outlet side of the pump is working well it should hold most of the fuel pressure overnight. Never seen an internal check valve on a Bosch fuel pump, just the internal recirculating valve that will open so fuel will recirculate internally instead of burning out the pump if outlet flow is pinched off.

Fuel flows through the entire motor section of the pump lubricating the bearings and cooling the spinning motor armature.The actual fuel pumping race and rollers is in the last half inch of the pump before the outlet.
Not all rear pumps have a check valve and I can't remember which do or don't because I replaced both of them with Bosch Motorsport 044 pumps to try an get more fuel for CIS when I had a 930.

Last edited by JFairman; 07-15-2018 at 04:25 AM..
Old 07-15-2018, 04:23 AM
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Quote:
Originally Posted by h20cooled7 View Post
If internal check valve goes bad will you know it or will the front just hold pressure? im just trying to zero in on a hot start issue. Thanks for response!
My suggestion is to take a look at the fuel accumulator. You can put a set of CIS gauges on the car to verify that the pressure is going down when the car is turned off first. There is a set of parameters posted that lists the amount of allowable pressure drop over time under "Leak Test" where you should maintain 1.4 bar of fuel pressure over 20 minutes.

It makes sense to look at the check valve first because it's inexpensive and easy but my money is on the accumulator if it's been in there a while. Shop around for the accumulator, prices will vary widely.

Good luck!

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Old 07-15-2018, 05:05 AM
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