going to in stall this pump in the moring just wondering if any of you have left the stock lift pump in place thought is two is better than one. http://store.summitracing.com/partde...part=SUM-G3136

 

If you go with both, you might want to add a regulator to keep it under 15 psi. That pump looks like it should be adequate all by itself, although a "big line kit would help lots. Get rid of the restrictive banjo fittings.

 

why 15 i have heard that a vp 44 will handle 21psi thats where im hoping to get with the mods i got now i can drop tp 6 or 7 easy. and have got a 120 quad box on the way.

 

Some have had IP o-ring issues above 15 psi. A big line kit will help with your pressure drop. The vp44 has a vane style delivery pump inside it that will out suck what your lift pump can supply through the stock fuel lines. A big line kit changes that. The pump your going to use delivers 140 gph. No matter what you did, you could not burn 140 gallons of fuel in one hour. Thats almost six full tanks.JMO

 

I hope the VP can handle more pressure than that cause mine has seen a steady diet of 41psi at cruise and 37psi WOT for the last 45K miles.

IMO big line kits will not save the VP.

The VP can only consume X amount of fuel. If you are feeding it with X+ some more, line diameter is NOT an issue. The restrictions that you cannot change are in the throat of the VP. In other words, you can run -8 line to the VP, but it still has to pass through the internal diameter of a 12mm fitting.

-6 is plenty big and still maintains fuel velocity. If anything, -8 can actually provide less psi at the VP because of pressure drop. But then it's the volume vs pressure debate again.

I would drill and tap the filter housing for 14mm fittings and run -6 on the pressure side. On the suction side, I would run -8 and a Vulcan Draw Straw.

The only issue you may encounter from a pusher pump install is hard starts due to high fuel pressure. This is easily fixed by using an adapter in an oil pressure port and a simple switch. In other words, it doesn't start until you have a minimum oil pressure.

There's lots of ways to do things, but keep it simple. You'll be glad if you ever have a break down.

Dave

 

results 21 at idle and 16 wot but now i need a clutch do these have adjustment.opps just a bit of air in the slave cylinder look at help for a laugh.