QuestionQUESTION: Hello Howard, ran across your good advice the other day, and thought I'd call back.
I too have an aftermarket electric fuel pump, in fact I like it so well that I put another one on my outboard boat motor, not inside the cowling, of course. I'm careful to always add an on/off switch,a good pressure limiter, some Sta-Bil at each fill up, and all lines are replaced with the latest kevlar reinforced "see through" high pressure ones. With this setup, I think that todays alcohol added fuel is less a threat than could be. The (Ignitor brand) solid state setup has been a help in getting more fire to the plugs, and all extra hoses and "stuff" has been removed, and the motor retimed.
However, after some time trying to get the horn and turn signals to work, I wish I could find a clearer or larger electrical wiring chart. Found one in color, but it wouldn't download - maybe too old or corrupted ?? Is there one that can be expanded for the 1974 American wiring setup ?? If I can find the last shorts(?) or switch problems, it will be back on the road.
Thanks for helping those who need good advice, we all run into problems occasionally and depend on your specialized knowledge to get the job done.
Best wishes on the holidays, Cal
ANSWER: Hi Cal,
Sounds like you are doing it right. I agree about the wiring diagrams. I often have to use a ruler and a magnifying glass to follow some of the diagrams or like you say enlarge them.
If you found one on the net but couldn't down load it all you needed to do was get it on screen and hit your "Print Scrn" button on your key board (which puts the picture on your Clip board) and go to a program like Paint Shop Pro or most any drawing program and look under the "Edit" pull down menu and hit "Paste as New Image" or hit "Ctrl + V" to put it on screen and you can enlarge or modify the picture from there and print it.
I have a lot of Brit car diagrams and if you can't find any usable let me know and I will post one on my web site for you to copy.
The very best diagrams I ever found were from Jaguar electrical training manuals and I had thought about using the format to redraw MG and Triumph diagrams. VW use to have a good format in their factory manuals too. I may soon redraw the MG/Tri diagrams using a combination of the Jag and VW format. It would have to be a booklet with a page for each circuit of the diagram but very easy to use. It is on my "Things to do" list.
Let me know if you want me to post the diagram I have of your car on my web site for you to copy.
Howard
---------- FOLLOW-UP ----------
QUESTION: I would very much appreciate your diagram, I tried three times on the other one, and the result was still too "muddy" to decipher. Blowing the ones I found just made them less clear, and I have a Cannon photo quality printer. Some of us don't have photon shop, me for one. Doing the electrics as pages sounds like the best idea yet, would be glad to send a contribution for your effort.
Couple things I might mention for those putting on an electric fuel pump. The regulator must of course be - after - the added pump, ask me how I know that !! Another thing is to watch for totally new leaks when the pump is on, particularly if a fuel junction is close to the motors heat running behind the block. Gotta be reeeeallly careful when adding electric pump pressure to the lines, probably replacing all with new (not added on) high pressure ones, but still check it out periodically, eh ?
Thank You, Cal
ANSWER: Try this diagram. According to my info the 73 and 74 were the same. This diagram is 73 and 74.
The diagram is at http://mg-tri-jag.net/73SpitUS1x1.jpg and the index to the diagram is at the same address except you need to change the suffix from US1x1.jpg to US21x1.jpg
I have some more diagrams it that is not correct but they are listed by Commission number, so if that one don't match let me have the Comm. # and I will find another one.
I still plan to make easy read diagram booklets but that will take time and I need to try to finish my MGB GT V-8 project car for a show in Oct. before I can start on them. I will list them on my web site when I start them. (http://mg-tri-jag.net)
Let me know if you can't enlarge the diagram, I can do it on my end.
Howard
---------- FOLLOW-UP ----------
QUESTION: Really, thanks to you, for the clearer info and wiring diagram. Super, now I can get the spit. done, I hope. Last thing seems to be that on hot days it can just stop on the road, restarts in a few minutes -- but !! Replaced the carb, solid state ign. and everything on the motor that I figured might be a problem, humm. My new trial fix is a hot and off/on in line switch between battery and coil, bypassing all the wiring harness. Second thought is to take out the thermostat and see if that helps. The third is to redo the Cut out switch attached to the oil line to the head, on the chance that is causing the motor to cut out with high oil temp.
Anybody got a good used oil cooler over your way, that might be a good next project? I design and build custom boats, so try to keep the hobbies in balance. Up this way you need to be outdoors, winter is long and rainy.
Thanks again, Cal
AnswerYou shouldn't have to do all of that. When it quits just spray starter fluid into the intake and if it starts it is fuel related and if it don't start it is ignition related. As simple as that.
Then go after the section that has the problem "Fire or Fuel".
Howard
