I changed my weldon 2345 pump to a mechanical racepump this year. i was quite a bit worried on fail/sucess.

First, its a EFi motor with 26 litre sheet metal plenum. I cant prime it with fuel och starting gas. It just backfires. So we had a hell priming it because it woulndt prime on starter alone.

So we added a volvo fuel pump parallel. To prime fuel to injectors and start engine... it worked. But we needed to add a back pressure valve...

I all works now. I been testing with 14 psi boost and some 26 psi boost to 6000 rpms... No problems with fuel starvation.

So it flows at least a 1000+ hp.

Going to stretch it to around 2000 when i add the next set of 160lbs injectors...

track times i woulndt tell. But the were really slow. Traction and heavy timing errors ,)

but it made 130mph @ 201m with 6 psi of boost... so i got one working round.

What was wrong with the 2345? Unless you're running alcohol, that pump should easily support +2000 hp.

Godsend, is this mechanical pump a Quickfuel unit or is it a belt driven pump?

its a www.racepumps.com unit.

Im running pump gas at the moment. But will go SV05 VP race fuel.

The 2345 pump took a great load on my battery. Wanted a pump that woulndt kill my engine if i threw of a alternator belt.

godsend,

I have the Race Pumps EFI pump and their matching deadhead regulator for my BBC 509, but haven't fired it up yet.

Now that the system is primed, should start easily without the Volvo unit as a backup, but I guess that if you ever work on the fuel system, you'll be back to the same priming problem.

Glad to see that it's working for you. I decided to go mechanical instead of electrical because it simplifies plumbing / wiring; and since it's a variable displacement pump, it should be less prone to starvation when braking / accelerating.

Good luck!

John

im using twin regulators. and i guess its something thereby, we are more people here that had some problems with it and the fix is to put a large backpressure valve between regulator and rails.

On their faq it reads thats leaking injectors will loose pressure. but mine drops directly, and i tried with the electrical pump with rails in the air, and i cant see any leaks...

Hmmmm...not good. The pumps are supposed to hold pressure when the engine is shut off. Sounds like a seal issue in the pump. Have you talked to Howard about this problem?

John

...Sounds like a seal issue in the pump. Have you talked to Howard about this problem?...John
Priming issues may not be all the problems - This thread on ChevyTalk (http://www.chevytalk.org/fusionbb/showtopic.php?tid/163141/) talks about losing pressure. Now, I agree that the issue must have something to do with seals and/or clearances in the pump itself - apparently (according to the thread) Howard would not/did not discuss problems on his site's BB - rather replied by email.
I bought one of the EFI pumps and regulators for the same reasons many others have (simplicity) but have not installed it - and I ceretainly want to see it be successful - but I also don't want another headache. If these problems are real (priming and losing pressure) they need to be upfront about them and address them. -Bob

I agree Bob. I have all the fuel lines / pump for my Holley MEFI, but I thought I'd go with the Race Pump setup. If I hear or read of more problems with the Race Pump keeping pressure, I'll probably go ahead and install the Holley / Walbro pump and the rest of it. Don't need any extra headaches on a new setup.

John

Mine is rock steady from idle up on pressure. Follows vacum perfectly.

godsend,

Good luck on the Race Pump, and please keep us informed. I won't be firing up my setup for sometime since it still has to go for body and paint. Just to leave my options open, I'm going to plump my 1/2" fuel line with a 3/8 "return so that I can easily switch back to the electric pump. Thanks again for the info, it's appreciated!

John

We have run some more. No problems. We use a front mount fuel cell, and that was a problem before but fixed in the 2007 version.

The pump can provide 450gph of fuel now, up to 150psi of pressure.

We now use 60 psi of base pressure. But use over 100% dutycycle @8500rpm and 28 psi of boost.

So if we will rev harder or go for 30psi + boost we will go to 70 psi base pressure.

i only have 8 160lbs injectors.

So, with a front mounted fuel cell you have no more priming problems? I assume the cell is mounted higher than the pump.
Howard seems to think that the pump can't lose prime because the pump is generally mounted lower than the rear mounted fuel tank. The only problem with that idea is the fact that the fuel line has to travel up and over the differential. Even with a one way check valve mounted just downstream of the pump there is still issues with losing prime. Given the problems others have had with this pump, I'm not ready to use it in a typical car with a rear mounted fuel tank, be it with a carb or fuel injected motor.

John

I'm using a racepump and have had it set for weeks at a time, and never had problems with it loosing it's prime.

Skeeveman,

What set up are you using? Stock tank? EFI or carbed? Only asking so that I can avoid any pitfalls to make sure mine runs right ( if I decide to use it).

Thanks!
John

Stock sumped tank with an 870 AED holley. I'm using the dead head regulator with no return line.