peregrine928

Is the fuel cooler really necessary and can I eliminate it with out issue? Any one have an fan controler for a 87 and the routing for all the vacum lines?

Any help is really apricated!

Rob Edwards

Do you _ever_ use the air conditioning? Might be a bit of a bear to find the right fittings to extend the suction line from the expansion valve thru the firewall to the hardline. Or do you mean just bypass the fuel return circuit that goes through the cooler?

No help on the fan controller (sorry), but here's the 87+ vacuum hose diagram:

dr bob

Better question might be "do you ever drive on days hot enough to need or want air conditioning?"

The history of the fuel cooler starts with a problem seen on many CIS cars (not just Porsche cars) used in warmer climates. For instance, sitting in raffic here in Los Angeles, or after a brisk sprint into the Sierras in the summertime as the tank level dropped, my CIS-equipped car would vapor lock due to heat added as fuel passed repeatedly through the hot engine bay and back to the tank. Eventually the fuel in the tank got so hot that it would boil in the suction of the fuel pump. So Bosch learned that they had to figure a way to strip the added heat from the system.

Don't take it out.

peregrine928

Thanks to both yes I need a/c in the rainy season as it gets unbearable. Thanks for the vacum diagrams as most of my hosesnhave gone awal, is there also one specific to the engin bay havac vacum lines.

Hai gebissen

What were you thinking might be gained by eliminating the fuel cooler?

WallyP

There should be a vacuum line diagram on the underside of the hood.

peregrine928

Clean up under the engine bay and a few less fuel hoses. Nope its a German car.

GregBBRD

Chris Cervelli was telling me that the 944 series cars (on the race track) have a really serious problem running on warm days in Colorado.

Seems the fuel in the tank actually boils when they come into the pits and remove the gas cap to add fuel.

I guess the reduced atmospheric pressure adds to the problem.

He was trying to figure out how to add a fuel cooler.