removal of lower cold start valve bolt

[afields]

My 80 FI spider is running rich; it has a black sooty spot on the ground where the exhaust blows out and when you hold a piece of newspaper behind the tail pipe, the exhaust spits some droplets, gas maybe? I wanted to check the cold start valve for leakage as it is suggested in Brad's FI guide that this could be a cause (I thought it might be leaking continuously even with warm engine, causing the too rich condition). Now to my problem. I can remove the top allen head bolt on the cold start valve but the lower bolt is impossible to get at with a standard 5 mm allen wrench because the nipple for the injector hose is aligned with the bolt head and gets in the way. How do you get that bolt loosened? Thanks for any suggestions on removal. Also would love any other suggestions for troubleshooting this problem.

[rlux4]

Afields, You'll have to cut short end of the allen wrench. Just leave about 1/4" past the elbow, and even then you may have to have the top bolt out and pull the body of the valve out as the bolt retracts.
Ron

[afields]

Thanks Rlux. I will give that a try tomorrow. I actual cut a short straight length from an old allen wrench an used a vise grips to turn the bolt, but I couldn't get enough torque to loosen the bolt this way. I guess I have to cut the short end of my good allen wrench as you suggest.

[So Cal Mark]

you can remove it to check it, but first disconnect the wire connector and confirm that the thermo time switch isn't supplying power to it all of the time. You can clamp off the hose to it to stop the fuel supply also and see if that changes the way it runs. I have a very small pair of channel lock pliers that I use to loosen that lower allen bolt, then wind it out.
I'd also check the pressure regulator for leakage; remove the vacuum hose to it. If there is fuel or wetness there, the diaphragm has failed.