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fuel system? trouble shooting
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andrew30
New User
Dec 29, 2006, 11:12 PM
Post #1 of 2
(1720 views)
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fuel system? trouble shooting
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Hi Everyone,
I have an '86 Mitsubishi Magna with a carb. It doesn't get used much but usually gets along reasonably well.
Now when I try and start it the engine turns over well but (if the engine starts at all) it idles along for a minute or 2 before dying. If I try it again it just turns over and won't start. I.e. if its going to start at all (for a min or so) it does when it's cold.
To try and fix it this is what I've done (with the help of a repair manual):
1. Put 5ltrs of fuel in it as it was pretty low
2. Checked I have spark
3. Looking down into the throat of the carb (with air filter removed and choke flap thing open) I pumped the accellerator thingy to see if I could see a squirt of fuel out of the nozzle. A couple of random times it squirted fuel but it doesn't anymore.
This led me to believe its a fuel problem I have. So I then:
4. Changed the fuel filter (1st time in 100,000ks)
5. Pulled the fuel supply hose to the carb off and turned the engine over to see if I have fuel supply.
6. Wedged open the choke in the carb throuat to make sure it wasnt getting stuck on
In step 5 (above) when the engine is turned over for a few seconds no fuel comes out of the fuel supply hose but when the engine stops turning over a bit of a fuel comes out the hose. Probably only a tablespoon or so and it isn't pumped out. Just sort of bubbles out.
So after all that my question is:
Should the fuel be pumped out of the fuel supply hose when the engine is turned over? And how much fuel should be pumped?
I don't think the following has anything to do with my current problem but thought I'd mention it anyway in the hope of an accurate diagnosis 
Many Thanks in advance for any help/thoughts/suggestions. I'd like to keep the car on the road for a year or 2 more even though it's had a bit of a hard life lately.
....................
Recently I decided to flush out the radiator as it was full of very rusty water. After flushing it out as much as I could I noticed that there were some leaks in the fins (they were probably blocked up by rust that I flushed out?). I got some Bars leaks and put it in the radiator and viola no more leaks. Problem was that the first drive overheated the car big time. Smoke, nasty noises, and all that. However after it cooled down everything seemed fine and I've driven it for a week or 2 since then (till it decided not to start that is).
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steve01832
Veteran
Dec 30, 2006, 6:20 AM
Post #2 of 2
(1715 views)
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Re: fuel system? trouble shooting
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Check the fuel pressure. The service manual you mentioned should have the specs in psi. You will need to obtain a fuel pressure guage. It sounds to me that the fuel pump is at fault.
Steve
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