Nice looking '87. It's a very close cousin to mine, almost same configuration but mine is an auto.
Regarding the fuel filter, the oem is in the location described by camoit, but it's virtually impossible to remove/replace on this specific body configuration (2nd gen, short bed, reg cab) without removing the bed or dropping the gas tank.
There's a thread about this here somewhere, but to "reach it" you have to remove the front panel of the drivers side rear wheel well, and then you have to magically get your arm into a very tight space, past all the fuel system hoses and the bed support. With some effort I was able to touch the filter and even get it loose from the mounting clip, but it was impossible to loosen the clamps and hoses with one hand (you can't get two in there).
If you happen to remove the bed or drop the tank for any reason, I highly recommend you delete the filter in this location, and add one in the engine compartment. I just removed the bed to clean out the frame, and I can honestly say that removing the bed was easier than trying to reach that filter through the side of the truck.
I you can swing it, you should consider getting the service manual, it's a very valuable resource.
Here's one for sale, I think it's worth every penny, but if you don't get it and need any specific info, just ask and I'll send you pictures from mine.
Good luck.
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