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Author Topic: MCI wont start  (Read 8530 times)
viking1
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« Reply #45 on: August 02, 2011, 08:33:19 PM »

OK. I had to go to work for a while so I didn't have a chance to play with the bus. Got home a couple of days ago and started tackling the bus wont run issue again. It has no lift pump. It runs just great if I have a 12 volt fuel pump hooked up to the #2 filter. So today I removed the fuel line where it goes to the # 1 filter and hooked the 12 volt fuel pump in line and it pulls fuel from the fuel tank, no problem. I disconnected the pump put the fuel line back on and hooked the pump up to the # 2 fuel filter for prime. Fires right up and runs great. when I unhook the fuel pump it runs the filters half down and dies. I have replaced the fuel pump. I wonder if I might have gotten a bad rebuild or if i needed a right hand pump instead of a left hand pump. The pump that came of didn't have any markings on it, but the guy I bought the new pump from was sure it was a left hand. Any ideas. its a 1989 102c3 8V92. Angry Angry
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luvrbus
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« Reply #46 on: August 02, 2011, 08:41:57 PM »

It has marking has a tiny arrow under the bottom fitting all fuel pumps running of the blower in the front turn to the left,I still think you have a lift pump in the tank on that model bus but I could be wrong 


good luck
« Last Edit: August 02, 2011, 08:44:44 PM by luvrbus » Logged

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viking1
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« Reply #47 on: August 02, 2011, 08:49:28 PM »

how would I find the lift pump. There is nothing on the rear start panel
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thomasinnv
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« Reply #48 on: August 02, 2011, 09:56:55 PM »

the lift pump, if so equipped, would most likely be in the tank or really close to it.
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1977 MCI Crusader MC-8
8V71N/740
95% converted (they're never really done, are they?)
viking1
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« Reply #49 on: August 28, 2011, 05:51:26 PM »

......Priming a Bus is an artform, I have learned!!!!!!!.........

Finally....... I think I got it.

 So to figure out whether it was my pick up tube in the tank or the fuel line, i disconnected the fuel lines on both ends and blew air through it to make sure I had the right one. Then I put the line going to the #1 fuel filter in an empty bucket and hooked up a 12V fuel pump on the other end. It took several minutes for the fuel to make the journey. Once I had fuel coming out I hooked it up to the fuel filter and unhooked my pump and put my line in a bucket. And wouldn't you know it, the bus ran like a champ sucking the fuel from the bucket. I shut the bus of and carefully hooked the line back up to the tank thinking I had just eliminated the fuel line being my problem. I figured it had to be in the pick up in the tank. But guess what? I hooked it all back together and wouldn't you know it. PROBLEM SOLVED. It needed to be primed but I guess priming it in the back as I had been doing just didn't cut it. I had to prime it from the front at the tank.

SO what was my problem, was it the fuel pump? I replaced it. Or was it pilot error. I had forgotten that I took fuel out of my tank to put in my tractor (about 5 gallons) the old fashion way, hose in tank and suck and let gravity flow due the rest. Now I wonder if maybe that was my problem. All along I was doing all this trouble shooting when actually I may have created the problem myself. Roll Eyes Roll Eyes. I will never know I guess, but just in case I don't think I will be siphoning any more diesel out of the bus for the tractor......

I am one happy bus Nut. At least until the next problem comes along.
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luvrbus
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« Reply #50 on: August 28, 2011, 05:58:53 PM »

Probably the latter you just never got it primed sometimes they can be a bear  be sure and hang on to your pump they are priceless

good luck
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