There is no 86 on OVP

Follow these steps IN SEQUENCE

These have to be done when condition is present b/c you have an intermittant condition.

Remove FP test plug from rail and install a gauge.
Remove F Pump relay and jumper 30 and 87 at the connector [ 3 & 1]
That is pumps , direct..do you have a gauge reading?

If yes , pumps are OK
Remove jumper.

Key ON , take a V reading at 85 & 86..[4 & 5] . 86 will be + for meter leads...or just use a 12v test lamp. Hook test up and then turn key ON.

Voltage w/key ON ?

Re-install relay.

Key On...Spin fuse # 6 in it's holder.
Gauge reading?

Look at OVP ..you should have pins 1 and 2 [ 30z & 7U ]
Do you see them?

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A Dalton