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Fossilhorn22 replied to the thread 1988 mercruiser 5.0 alpha one.

I did remove the fill cap but no change. Thanks

Jun 26, 2025
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Fossilhorn22 replied to the thread 1988 mercruiser 5.0 alpha one.

I checked the one on the carb inlet. No debris at all.

Jun 26, 2025
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Fossilhorn22 replied to the thread 1988 mercruiser 5.0 alpha one.

I did check the small filter in the carb inlet. Perfectly clean...

Jun 26, 2025
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Fossilhorn22 replied to the thread 1988 mercruiser 5.0 alpha one.

Ill take a look at this asap Thank you!

Jun 26, 2025
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Fossilhorn22 replied to the thread 1988 mercruiser 5.0 alpha one.

Ok...Thank you all for the suggestions. I have tested and corrected/replaced everything that has been suggested so far. I had it...

Jun 25, 2025
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Fossilhorn22 replied to the thread 1988 mercruiser 5.0 alpha one.

I will check that tonight and post my results. Thanks!

Jun 11, 2025
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Fossilhorn22 replied to the thread 1988 mercruiser 5.0 alpha one.

Now you have me thinking....I did find two ignition switches under the seats that were bad. What could cause them to burn out?

Jun 11, 2025
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Fossilhorn22 reacted to JonBoat55's post in the thread 1988 mercruiser 5.0 alpha one with Like.

"Bad gas mixed with good gas just equals more bad gas" Its amazing how much carb engines hate bad gas. I didnt believe it till I...

Jun 10, 2025
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Fossilhorn22 reacted to alldodge's post in the thread 1988 mercruiser 5.0 alpha one with Like.

Welcome Check for spark Could use a motor serial number but being a 1988 it's most likely you have TB4 ignition

Jun 10, 2025
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Fossilhorn22 replied to the thread 1988 mercruiser 5.0 alpha one.

It does have the thunderbolt IV ignition. I just assumed that I had spark because it would fire up every time but doe shortly after...

Jun 10, 2025
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Fossilhorn22 replied to the thread 1988 mercruiser 5.0 alpha one.

That’s true. I tore the carb apart to clean and rebuild and everything looked good. I didn’t see any water in the bowl or debris in the...

Jun 10, 2025
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Fossilhorn22 posted the thread 1988 mercruiser 5.0 alpha one in Mercury MerCruiser Sterndrives & Engines.

Just picked up a 1988 mercruiser 5.0 in an old Thompson boat. Got it up and running in the driveway and everything seemed great. Took it...

Jun 9, 2025

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