rabbitman84

Hi everyone,

I'm considering buying an '85 trans am with the L69 H.O. V8. It's been sitting for a few years, and if I had to guess the fuel system will probably need some attention. I have a factory service manual for an '85 trans am, and it says that they have a mechanical fuel pump, but also an electric supply pump that prevents vapor lock. I was wondering where the supply pump is located, and what its part number is. I was also wondering what fuel tank I would have to get for it, and if the TPI models use the same fuel tank as the carbureted ones.

Thanks

zed-028

Hate to say it, but that pump is in the tank and its either a drop tank or cut an access hole situation. The pump itself is nothing special and many people tend to throw them away and just stick with an upgraded mechanical pump on the block because the in tank one is such a pain in the *** to change.

I dont imagine the tanks are different.

Drew

iTrader: (58)

Go here - https://www.thirdgen.org/forums/hist...ho-camaro.html

Read the part about the fuel pump. It'll basically show you how to replace the intank pump, eliminate the mechanical pump, and how to use a typical Holley fuel pressure regulator.

jmd

iTrader: (4)

You can go either way. I have changed the in-tank pumps and the block-mount pumps. Either can flow enough for the L69.

The reason I would go for the electric pump and a regulator:

The mechanical pump with return (L69 and 85-up LG4) are not common anymore. There are a lot more manufacturers making electric pumps so you can use a different one and let the regulator correct the pressure.

In my experience of daily driving the mechanical pump 4bbl stuff (200,000mi plus,) the mechanical pumps don't do well with today's ethanol-blended gas. Yeah, I can change one more easily than the one-tank pumps.

But again, you can go either way. Hope your T/A is a lot of fun.