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How do i check my EFI Relay?

I just Bought a 1977 datsun 280z. the car started and ran as long as i shot carb cleaner in the air intake. so i know it has spark and i sounds like a good engine. i found that there was no fuel pump so i replaced it with one from my former 280z. but i got no power to the pump. i bypased the pump and got fuel to the injectors, but there is no pause to the injectors. after some reaserch i found out that my car was infact a 1978 model(Dec. of 77)
so i went to check my relays in the engine compartment and found that there was some tempering with some wires. although the relays look to be intacked along with their wires ( and the wire are getting current) i have found some thicker wires along with it that have been capped off. 1) does anyone know how i can check the relays? 2) does anyone have a picture of what its suppost to look like under the relay pannel?

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Buy a new relay or switch one, then pull one at a time pulg in the new one to find out wich one isn't working.Just because there's power to it doesn't mean anything,it could be that the contacts are burnt together and theirfore not giving you the "injector pause" good luck.

Posted on Nov 23, 2008


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The fsm covers all these numbers, so you look them up. ok?

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Probably same. Datsuns are famous for keeping the same carburetors (and other parts, as well) with only minor year to year modifications. My '79 Datsun pickup 620, right now has a carb from a '73 Datsun 620 parts truck, runs okay-for a hitachi.
Check ebay for new, remanufactured, or used- pretty sure they would have a lot of carbs for your car. The best place to buy new or remanned carburetors, especially for our older datsuns, is Very nicely planned (and huge!)catalog, too, with easy access.
Don't know about your 280Z, but with the 620's 2.0Liter engine(L20B), weber carburetors are all the rage now for them. They are excellent carburetors and very reliable, even claim to increase mileage over stock, but for $250, I guess I'll have to motor on with the old hitachi a bit longer.

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