71 911t no start

[benzboy]

hey. I have a 1971 911t that cranks over but wont start. when I spray start fluid in the intake, it fires up for a second or so. so I assume its a fuel problem. . the fuel pump isn't working. I pulled a fuel line, turn the key and know fuel is coming out. and the fuel pump isn't making a noise. it has zenith carbs. I was surprised what a fuel pump for zenith cars cost. $630!! could there be another reason why the pump isn't working (other than being bad) can they be rebuilt. thanks

[James Brown]

these would work, 3.5 psi is what you need
Porsche 356 Carburetion - Page 2

[924CarreraGTP]

I'd get the pump rebuilt, or else take it apart yourself and see if you can free it up. If the car has been sitting for a long time, the pump might just be frozen. You can take the pump part off of the front of the fuel pump by removing 4 screws, hook the pump up to 12volts, and spin the shaft by hand to see if it frees up. There's a Viton O-ring that seals the pump to the front of the pump body. It's best to replace it, but you can swell it up with some automatic transmission fluid, tighten the screws really well when you put it back together, and it should hold.
If the car has been running and the pump just suddenly won't work, I would check your fuses first. It's been a while but I think it's number 8. Don't quote me on it. There are some good posts about home rebuilds, and who to send the pump to for a professional rebuild. Do a search on the pelican 911 forum.

[SLCooper]

Had same problem as you with my 71T and send my fuel pump to Fuel Injection Corp in Livermore, CA. They did a great job on rebuild which cost about $200. I recommend getting your old pump rebuilt.
Scott

[david.avrahami@]

It is not worth reconditioning....just get a new pump, not that much more expensive....
and try to fix yourself the old pump as a spare

[benzboy]

thanks for the replies. actually the car has been sitting for over 6 months or so. I would like to get it running, but I will be soon doing a total nut and bolt restoration on it. not sure what I want to do. get it rebuilt or buy a new one.

[Shuie]

This probably wont help, but if you have unplugged the harness for the fuel pump for any reason then double check the wiring and make sure you didn't flip the +/- connections. Thats probably not the issue since it sounds like the pump may not be running at all, but I figured I would mention it.

[Dave Kost]

check the points

[Magfin696]

Check wires leading to pump for 12v with multimeter or test light. Also check ground wires. The key should be in on position.

[924CarreraGTP]

It's really nothing to pull the pump off of the front of the fuel pump. It's not a hard task at all as compared to even changing brake pads. Most people have the pump rebuilt only if it's leaking from around the electric connector. If it's not then you might could get it working fine again with something as cheap as a Viton O-ring in between the pump, and the body.
I shot some WD40, and B12chemtool into the pump body, hooked it up on 12volts, spun the shaft a few times and it came to life. This was after my car sat for approx. 3 years. Afterwards I poured some fresh fuel into the body to wash out the WD40/B12, (make sure you are unhooked and far from 12volts, or sparks) installed the pump back on the pump body, and my car has run great for the last 4 years. Until I messed with the carbs.
The problem with a different style pump is that you have a return line and a total of three fuel lines. Two lines to and from the tank to the pump, and one from the pump to the carbs. If you use a different style pump, you will have to block off the third return line that goes back into the tank. Those pumps had an intake line and a return line back to the tank to keep the fuel pump and fuel running cool. It was a decent system, and if you change it, it won't be original. So it's really at the discretion of the owner which way to proceed. Just don't let anyone tell you that you can't fix it yourself. There's a high probability that you can with a screw driver, and a vise.