Re: 1993 900 NA fuel pump help- asking Justin, et, al... - Saab 900 Bulletin Board - Saabnet.com
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Re: 1993 900 NA fuel pump help- asking Justin, et, al...
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Posted by t [Email] (more from t) on Sat, 19 Jan 2019 05:48:37 Share Post by Email
In Reply to: Re: 1993 900 NA fuel pump help- asking Justin, et, al..., Justin VanAbrahams [Profile/Gallery] , Fri, 18 Jan 2019 13:28:46
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Thanks Justin,

I was wondering if there were any “moving parts” in the ejector pump, such as a check valve, etc. However, I now understand that there are none.

After I pulled the pump back out, I took the assembly apart, and looked at the arrangement again. All looked good, so I put it back together as it was. I then put enough gas in the tank so the canister would be submerged; hit the key and had 38psi, and the car ran for at least an hour- seems ok now. Also seems like the issue was “priming the pump”, by adding enough fuel to the tank to get the level above the canister. But, I am left wondering if the ejector pump is bad. That is, it will be interesting when the fuel level gets low in the tank, if the ejector pump will fill the can, so the pump won’t be starved.

One theory is that the old pump was good, as the car would run for a few minutes, but then would be starved for fuel and die. Could it be that the pump used the fuel up in the can, but the ejector pump would not keep the can full (could not keep up to the demand), and the pump would simply run out of fuel? Then, allowing the car to sit, just the atmospheric pressure on the fuel in the tank would force fuel in the canister over a period of time (like putting an empty bottle in a bucket of water- say over an hour), and the car would start again, run for a few minutes and die.

Also, the pump that I took out had no name/numbers on it- probably good to have replaced it anyway. I put a gloved hand in the tank and felt around the bottom. It seemed like there was a depression in the bottom at both the right and left sides of the tank bottom approx 180 degrees apart, which would accommodate the ejector pump siphon.

The assembly had previously been (prior to me) installed 180 degrees to the way Bentley says to install, by aligning the marks. I still do not see the marks on the car or tank- the mark on the pump is obvious. But, I positioned per Bentley as best I could trying to get the siphon in the depression.

One more unrelated question- it has been a while since I put a clutch in one of these. But, while chasing spark briefly, I noticed that the 0 degree timing mark is nowhere near TDC of #1 (or #4). Rather it seems to be approx 90 degrees off. At TDC of #1, someone has chiseled an “X” in the fly wheel, that aligns with the plastic cover. So, it appears that fly wheel was installed in the wrong position. Just wondering why there is not a dowel or such that would prevent this wrong installation position from happening.


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