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About one year ago, I replaced the fuel pump on my 89 900 NA. I have the rotor pump so I did not replace the entire pump unit but only the central metal unit. While I had the pump apart, I did not notice any check valves as part of the plastic unit. Since the exchange, have noticed that I need to crank a little longer to start the car, especially when the engine warm. I had a new spare FPR and the exchange did not solve the problem. So it must have been the fuel line check valve.
Ordered a new check valve a while ago and took advantage of a long weekend to replace the part. Since the fuel lines are pretty old, took the advice I found on this board to cut off the check valve (leaving the plastic sleeve in the line) and use a rubber fuel hose with hose clamps to attach the new check valve to the old line. Easy right?
After cutting off the check valve, took it apart to confirm diagnosis of bad check valve. Noticed that the check valve was going the "wrong" way. After some further examination, discovered that I had cut off the return line check valve. The pump line did not have any check valve in the inlet.
So here are my questions:
1) what is the purpose of the return line check valve? Why is there a concern that fuel could flow from the reservoir to the FPR?
2) since my return check valve is busted now, can I cut off the pump line elbow (which is completely open on my car), move that one to the return line, and place the new fuel inlet check valve in the right place on the pump side?
Right now the car is disabled and I would like to get it back on the road asap.
Thanks, Harold
89 900 143k
91 900 149k
posted by 12.72.1...
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