cjack, I am sorry a reply was not sooner.

My husband had the same as your husband 5-FU pump 24/7 for 5 days with the Cisplatin. He had two rounds of this as well.
We also had crisis occurrences with the pump.

The first round had the pump alarming several times throughout the 5 days. Emergency pic flushes fixed those.
The second round had the usual 5-FU pump alarming incidents with an added fiasco.
The pump fell in the bathtub while my husband was soaking his miserably constipated body and associated hemorrhoids. (Thanks to those pain meds!) They gave him a new pump the next day.

I can speak lightly of this now, 3 years later, but it was total panic and chaos at the time.

Checking his records for the thrush tie in, I found 16 days after the first round he was diagnosed with thrush. After the second round he had white patches like thrush again, but that time the RO stated it was mucusitis, not thrush.