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Your 1990 will have an IDI 7.3 diesel engine in it and there isn't much you can do. You can turn up the fuel, but that is dangerous without gauges. Another option is to install an aftermarket turbo. If you want to turn up the fuel here is a link to the page that explains it. MAKE SURE YOU INSTALL A PYROMETER ( EGT gauge) FIRST!!!
Normally, only 2 things stop a diesel from firing: 1. no fuel 2. not enough compression
No fuel can be caused by (obviously no fuel) or a failed fuel pump. To test, have someone turn the engine over and then sniff at the exhaust - does it smell of unburned diesel? (If you've run out of diesel recently, you may have an airlock in the system, this needs bleeding out.)
Not enough compression needs specialised equipment to test - that's a garage job.
Fill your fuel filter all the way up and take precaution not to get any air into pump. Try this several times. Once you get air into some pumps it can be very hard to bleed it off. There should be some way to bleed. Look on pump for bleeder.