Distributors have a "key" to make sure the cap goes back on the right way. Make sure the key is lined up properly and the bolt should be able to do it's job.
At the base of the distributor, there is a tab, with a bolt in it. Tightening or loosening this bolt, will do the same, with the distributor. The distributor, by the way, times the motor, so, you will need to retime it.
Remove the distributor cap. Remove the bolt in the clamp holding the distributor base to the motor, using a 1/2 inch box-end wrench. lift the distributor straight up. Note the orientation of the rotor. When reinstalling the distributor you'll need to stick it back in there with the rotor pointing in the same direction or the timing will be way off. The rotor will rotate slightly as the distributor goes back in. Also, the oil pump drive shaft is driven by a hex shaped hole in the bottom of the distributor. You have to wiggle it around a bit to get the distributor to slide down onto the oil pump drive shaft. Once you get it back in snug up the clamp bolt, put the cap back on the distributor, start the car and check the timing with a timing light. Adjust as needed by rotating the distributor. When the timing is right, and you do in fact have oil pressure, tighten up the clamp bolt.
At the base of the distributor is a pinch bolt. Loosen the bolt and pull it out. When re-installing the distributor, pay attention to the notch on the base of the distributor. It will only fit one way.
You will have to get a short screew driver to get to the back distributor cap locks. Are you can mark the distributor and then loosen the hold down bolt and rotate it so you can get to the locks on the cap.
Have you loosened the retaining bolt? That is the bolt that holds the distributor in place.
One bolt at the rear of the intake manifold holds a clamp that is shaped like a Y. Remove the bolt, take the clamp off and slightly twist or rock the distributor back and forth and lift it straight up.
The bolt is removed from a Marlin model 81 by first opening the bolt completely, then while holding the trigger back all the way, continue to pull the bolt the rest of the way back. Sometimes it is necessary to hold the trigger back while re-inserting the bolt.
That's not a fuel thing, it is your electronic ignition. Your distributor bolt is under the distributor, if you're standing on the right side (passenger,) it's hard to see under there, but it's there. If you look closely you will see a fork like plate under the distributor the bolt is to the out side of it. The bolt is 1/2 in, you need a distributor wrench.
Open the bolt and rack it back. Hold back the trigger. The bolt should slide easily backwards until it detaches from the rifle. If you have a rear sight that blocks the bolt from being removed, simply rotate the bolt handle clock-wise to get it passed the sight and remove as usual.
Loosen the distributor hold-down bolt. Standing in front of the vehicle looking at the engine turning the distributor clockwise advances the timing. Turning the distributor counter-clockwise is retarding the timing. Hold the distributor steady while tightening the hold-down bolt. Factory hold-down bolt needs a 1/2 inch wrench.
Warm your engine up before doing anything. Open the hood and remove the bolt from the distributor. Hook a timing light to the first cylinder and point it to the harmonic balancer. Rotate the distributor until it aligns with the 10 degree mark, then add the bolt back and tighten it.
you need to tighten the bolt on the side of it