I'm haveing a strange problem   

  I have a Holly blue fuel pump with a seperate press regulator set at 5 psi. When I turn it on it will hold 5 psi (on the gauge) for about 2 min, than you can hear the sound of the pump change and it pegs the gauge to over 10 psi (the gauge only reads up to 10). If I switch it off and back on it goes back to 5 and starts all over again .    I tried clearing the regulator (sprayed it with carb cleaner), no change   

 Its plumbed like this, tanks - switching valve - pump - filter/water seperator - regulator - motor. The regulator is also Holly and looks like a T, inlet on the bottom - adjuster on top - left side out to motor - right side to gauge .  Is this right ?

ANyone ever seen or used one of these?  http://www.racepumps.com/index.html  Costs more.

Another Clay Smith vote here! Mechanical pumps have been used reliably in autos for many years. The Clay Smith pump can deliver sufficient fuel volume to all but the most demanding engines and it self regulates(to a point). And they're silent .

I've had zero fuel delivery issues with mine. It's been running for 5 seasons.

never had a problem with my holley blue pump, one of the lucky ones i guess

The Holley Blue pump puts out 110 GPH @14psi And the normal carb only allows 7psi so it has to be regulated to the carb.   It will actually fill your crankcase full of fuel really quick and hurt the carb with no regulater.
I think thats correct


2sav

I think he was refering to the clay smith self regulating to a point

 Thanks for the info guys, but I cant use a mech pump ,   I "forgot" to mention this is on the 2 smoker  .  So should I replace the regulator ?

 My jet boat has a Carter elec pump = no problems.  EVER !

In all three of the carbed engines I've had I had the regulators set at 14.

Had the BG 400-2 and the BG 2 port plus reg on my old truck. Worked well, The fittings I ordered came in the wrong size. The one fitting marked 1/2" was actually 3/8" when I put the micrometer to it. So I sent it back to BG and waited for 2 weeks to get the replacement, which was the right size. 4000 miles and a year later never had any problems.

mine doesn't have the overflow port , is it because it is not a marine application pump

Guess not as this is a marine pump and regulator.  If you look at the middle of the pump and down by the base you'll see the overflow tube.  I think it's suppose to be plumbed to the top of the carb.

it is supposed to be plumbed to the top of the carb...

Just another ugly line to run.   

I have the holley blue and have never had a problem with it. Someone I know was running the clay smith and the piece that goes into the motor broke off and destroyed the timing chain! I wonder who that was ? But he did go back and they did make it right with him so that says alot about there customer service.

I don't think the fuel pump was soley the blame on that one.

...You say it regulates to a point?  At what point do you need a regulator on a carbed motor?

A mechanical pump will only pump as fast as the engine is turning. So when at idle, it's not working very hard. When RPM/demand goes up, the pump starts moving some fuel.(Old auto pumps used to stop pumping when line pressure built up to a set pressure and would start pumping when the pressure fell back off, although I don't know if the Clay Smith pumps do this or not) An electric pump pumps like crazy all the time. That's what I meant by 'self regulates'.

I feel that you should always run a regulator in a high perf application . The best regulators are bypass style IMO. That way, there's nothing between your pump and your carbs.

There is no way that thing spun 8k. I saw the peices and it looks to me that the pump gave out and took the timing chain with it.