I NEED VACUUM LINE DIAGRAM FOR 78 GMC JIMMY 400

1978 GMC Jimmy

Tiny

jared Falcon

February, 27, 2013 AT 7:21 PM

I need vacuum line diagram for 78 gmc jimmy 400

FOUND 16385 RELATED QUESTIONS

Wiring Issue?

68 ANSWERS
134 IMAGES

3 Answers

Tiny

caradiodoc

February, 27, 2013 AT 7:34 PM

There's a sticker under the hood that shows the correct diagram. They are also shown in the manufacturer's service manual but there will be a lot of variations. You have to find the right one based on engine size, type of transmission, federal or California emissions, and other options.

Tiny

jared Falcon

February, 27, 2013 AT 7:59 PM

I just need an idea where to start. Any diagrams. The basic

Tiny

caradiodoc

February, 27, 2013 AT 8:11 PM

Start with what? Are you re-plumbing the entire engine or just looking for where a loose hose goes? I can help with some of the specifics but I don't have any service manuals that go back that far. I don't even know for sure if the online service manuals like AllData and Mitchell have vacuum diagrams. Is the sticker under the hood missing or do you just not know how to read it?

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