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I'm helping my uncle is fix his 89 S10 Blazer, I bought him a fuel tank, but I accidentally got him a fuel pump for a 87-91 s10. I know they're similar in many ways, but are the fuel pumps interchangeable?

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I'm going to assume your asking if the fuel pump used in the S10 truck will fit the S10 Blazer.

I'm sure they are close, but the length could be different, or the connections outside the tank could be different.

I suspect you have both available, I would compare them very closely, if they are the same, go for it.
 

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If they're both a TBI system then probably yes. If one's a carburetor, no. Go on line with Rock Auto or similar site and look up the part # for each.
 
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