I have a 1989 Jamboree RV. It has a 426 ford engine. And I think it is throttle body fuel injection. I pulled in to a gas station to get gas and it would not take gas, it fed back. I tried to start it and it would not start. It has a vacuum pump, a filter and a fuel pump in that order on the lines. I pulled the fuel line and it has gas flowing.
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If you see a fuel rail or a short-throat throttle body, it is fuel injected.
If you see a carburetor... well, I think you get the point :)
From the year (unless it is a non-U.S. model), it is most likely FUEL INJECTED.
Check for any trouble codes in the engine computer, and have the fuel pressure tested. If it is throttle body injection. observe the spray pattern of the injector when it pulses. You should see a cone pattern of the fuel spraying down into the intake. If it drips, or appears anemic, the injector might be partially clogged. Try some injector cleaner in the gas tank.
Check your fuel pressure to seeif it is high enough. Possible fuel pump or filter which some of those trucks could have up to three fuel pumps, one in each gas tank and a pump along the frame also. Could also be a vacuum leak or a suction leak at the intake or throttle body. Another possibility could be throttle positioning sensor. An easy way to check for a fuel related problem is to lightly spray carb cleaner onto throttle body while trying to start and see if it will continue running on that. If it does then you have a fuel problem. Use carb cleaner safe for fuel injection systems.
Your 1989 cavalier is a 2 liter fuel injected engine so yes you do have a computer to run the engine so check your fuses and start with the simple and replace the fuel filter, air filter and clean the throttle body with throttle body cleaner. Don't use carburetor cleaner, the carburetor cleaner is to corrosive for the gaskets used in the throttle body. Also make sure all the vacuum lines are connected and not damaged, a bad vacuum line to the MAP sensor will cause what your having.
Good luck and keep us posted. Be glad to help you get your car running 100% again without the cost of a garage trying to be like the tax man.
Thank you for using Fixya
I'd guess with a 1989 you have throttle body fuel injection, which means that the "injector" is in the metal part that would be where the carburator used to be. Old cars had the air filter on top of the carburator.
you really can't see much of it.
With a vehicle that old I think you should retrofit any pump that matches within reason the original specs as with throttle body injection fuel pressure is critical. If it is the same as South Africa the agent will sell you any **** to get rid of you. Try fitting a Bosch pump with a pressure regulator (set it to spec ). Please change the filter.