So I did my belts, oil and all suspension I needed too and started my 1990 FC up today. There is a sound coming from the back drivers side of my engine thats like a pump whirring. I let it warm up fully and it just got a bit louder. It was out of brake fluid before I started it and there's no pressure on the pedal if that makes any difference? Also the air pump has been deleted. Really want to drive her but don't want to risk something.

 

fix your brakes first if you wanna drive her.

 

check the power steering fluid and your belts to make sure they didn't flip or roll off the pulleys.

 

If you press in the clutch does the noise go away?

 

Post a video of this phenomenon? Link to a youtube video? I agree your brakes definitely need to be taken care of before you proceed though. Why was it out of fluid?

 

Pretty sure i have a leak in one of my lines, but I have stainless lines on the way. The belts are all on and have little to no play in them. I can't remember off the top of my head if it went away or not while pressing the clutch, I'll look at it again tomorrow. Heres a crappy video of what I could get. Its the constant background noise that sounds kind of like whirring/blowing air (also have an exhaust).

 

crappy video shows no oil pressure on the gauge.
See if your sender is hooked up under the oil filter.It is a single yellow wire going to a bell shaped object under the oil filter(at the pedestal)

 

PO said that it hasn't worked since the clutch slave cylinder was replaced.

 

I'm gonna go ahead and second Styx on this.
If you're looking at the oil filter, just underneath is a goldish coloured bell shaped bit attached to the pedestal. This is your sending unit. There should be a little metal tab sticking out. This has a white clip that SLIDES over it on one side of the plug, not straight in. Find this clip hanging somewhere and you've found your problem. Make sure everything is real clean going back together.

 

And more than likely when the PO replaced the slave he knocked the wire off that sender. Check that.

 

Will do! Thanks guys!

 

Noise is now gone, just made sure everything was tight and it went away haha.