Quote:
Originally Posted by PeteKz
And let me pull this thread a little more towards the fuel pump. As stated above, I am using the new style generic Bosch pump, which I installed 5 years ago. I put it in the same rear location as the OE pump. I vaguely considered moving it to the front to be closer to the tank, as in the newer cars, but it was easier to just leave it in the original location.
However, a couple days ago, I was low on fuel and sucked air coming up a steep section of private drive to my house. This was due to me trying to run the tank as low as I could before pulling the fuel strainer at the bottom of the tank, to check that it was clear. When I hit that steep section, the combination of forward motion and uphill angle caused the remaining fuel to slosh back and uncover the pickup tube. Anticipating this might happen, I had an extra gallon of gas in a fuel can in the car. I then rolled backwards down to a less uphill spot on the drive, and added the gallon. It sputtered but did not fire up. Okay, maybe one gallon wasn't quite enough fuel to re-prime the fuel lines and pump. I then trudged up the hill to my house and came back with 3 more gallons of fuel and poured that in. Still no start, in fact I finally ran the battery down. A neighbor came out to help me, and he ended up towing my car up to my house with his pickup truck.
There it sat for a couple days on pretty level ground. Then I went to try starting it again, and it fired up. So, it looks like it needed to sit for some time for the fuel to reprime the lines and pump.
Now I'm thinking this is a good reason to move the pump to the front. Does anyone have a similar experience with an old car and moved the pump forward? Did it help with preventing the pump from sucking air on steep hills?
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I've never had an issue with the rear mounting of the pump.
I am a little embarrassed to say the one time I have run out of gas it was with my '73.5 911T. On the flip side I learned how accurate the gas gauge was. In the early 1990's I was driving north on FDR drive in Manhattan on my way home from work, gauge was very close to empty but figured I had enough to get over the GWB and fill up in NJ. Right before 125th st exit it started to sputter. I got off the exit and stalled. Not the best area back then. A homeless looking guy came over and offered to help. He went off for about 1/2 hour and came back with a gallon can of gas. I paid him and put the gas in the car. I put the key on, took off the air box cover and lifted the air plate for a couple of seconds till the injectors were primed, turned the key and it started right up.
Your belief that going up a grade causing the issue may really have been just no gas in the tank, not the slope. The CIS gas tank was a big improvement over earlier ones. If you look at the internals it has well placed baffle and the fuel outlet is the lowest point in the rear of the tank.
My thought is perhaps the fuel filter you added may have contributed to it taking a bit for the fuel to get to the pump in the rear location.
http://forums.pelicanparts.com/porsche-911-technical-forum/768320-cis-gas-tank.html
