I had a new small Sard FPR and it wouldn't hold steady above 20lbs. The gauge reading was just spastic jumping up and down.

I purchased a new Sard FPR and this time besides holding at 20&<lbs it holds 60&>bls but nothing in between.

Is there something we are overlooking somewhere?

 

I checked the Aeromotive FPR instructions to see if Sard's FPR instal is somehow backwards or upside down (rhd, toilet swirls in reverse kind of thing) but it's the same. inlet on the side, outlet underneath. What the heck is going on? Where's Beauler when you need him?
http://www.aeromotiveinc.com/pdf/13109.pdf

 

Update:
M'trix had the fuel lines wrong and it holds pressure fine now.

 

So the Sard FPR is perfectly fine?

 

How were the fuel lines incorrect, because I'm having this same problem?

 

Well I didn't think my mechanic could make a mistake or overlook something like that. If you look at the begining of my 500R thread which has their shop name in the title, you could tell I looked up to them very much. I took his word for it and bought a second one not wanting to run braided lines for Aeromotive or but new fittings (needed my car done and out of money). I thought I could return one but couldn't. So not being familiar with the brand he assumed it was bad because the diaphram is smaller them the popular Aeromotive. Sard has a race version that is like 2 or 3 times fatter but it's almost double in price (too expensive). Anyhow, without taking the extension manifold off it's heard to trace the fuel lines. The way I did was to remove the return and pull it out since it was intertwined and hard to follw which line was which. Shure enough the return and in take lines where wrong. I was givin the car like this, unbeleivable! My car sat in the back for three months, pleanty of time to forget what was done and plenty of time to recheck the fuel lines. Extremely dissapointed is the kindest way I can word my anger seeing I could have lost another engine from this.

From the secondary rail the line should go to the side intake port (standard for all as far as I have seen) and the return line connects to the bottom of the FPR goes towards the oil filter pedestal.

Make sure you unravel at least one line and physicaly trace it. It's easy to mistake one line with another when they are tangled together.