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Old 05-24-2004, 05:04 PM
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Oil Pump Problem???

I recently had probs with my mechanical fuel on my 84 GMC truck (305) pump so I installed an electric pump. The electric pump was installed with an oil pressure safety switch and a 30 amp relay. I had no power after the safety switch so I took it off and noticed there was no oil behind it, I than turned over the engine and nothing came out this open hole in the block???????????

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Old 05-24-2004, 05:18 PM
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Where exactally is the hole you used? There are only 3 that come to mind. One is next to the dist, that one usually has the oil sending unit in it. The next one is directly above the oil filter, drivers side. Last one is on the front of the block, above the timing cover. ALL of them should have full pressure.

Mark
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Old 05-24-2004, 05:23 PM
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it is directly above the oil filter, this is where the oil sending unit is. no oil here.
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Old 05-24-2004, 08:39 PM
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I removed the oil filter and cranked it over. There is nothing there either. Where does this leave me?

Quick run down.

It was not running the greatest so I pulled it into the garage. And rebuilt the carb.
Then it would not start and I traced it to the fuel pump. The push rod was not moving at all so the cam lobe was nfg.
I installed an electric fuel pump and the oil press safety switch would not close leading me too no oil.
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Old 05-24-2004, 11:19 PM
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Could the timing chain or gear have died? Pop the distributor cap and see if the rotor turns.
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Old 05-25-2004, 01:27 PM
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I will do that tonight. Does it sound like I am missing something obvious?
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Old 05-25-2004, 05:34 PM
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the fuel pump rod was not moving at all, definitely an internal engine problem if the motor turns and the camshaft isn't moving.only thing to think on that is the timing chain is off,u didn't do anything else to the car other than the carb? thats just strange for a chain to jump off by itself must have alot of miles on it! this is one of those things that boggles u for awhile lol.
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Old 05-25-2004, 08:28 PM
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I popped the cap off of the distributor and nothing was turning. Do I need a new rotor, how could this effect the oil pump. It turns over normally with bo weird sounds so I don't think the timing chain has piled up. Thanks for the responses guys, please state things that may be obvious to you but not necessarily to me. Thanks.
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Old 05-25-2004, 08:46 PM
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If you pulled the cap off, cranked the engine and the rotor does NOT turn, then you have a big problem. The chain could be broken, the cam gear could be stripped off, if its the plastic coated version, the cam could have broken or the oil pump seized and sheared the roll pin in the dist gear.

The reason that this affects the oil pump is because the dist shaft runs the oil pump. If the cam is not turning when you crank the engine, then the dist is not turning either, which also means the oil pump is not being turned now either.
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Old 05-25-2004, 08:58 PM
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So it would be safe to assume, since my mechanical fuel pump stopped working first, that my problem all along was my camshaft or chain. Correct?
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Old 05-25-2004, 09:14 PM
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I would say so. Usually when that happens, the engine turns over faster than usual, a dead giveaway to a broken chain or stripped cam sprocket. Sorry
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Old 05-25-2004, 10:06 PM
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The engine is not turning over any faster, so then it is not the chain? That little guy crying tells it all, that is cool even if it is at my expense, or should I say expens-ive
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