Fuel pump volume

Well, I had been putting off installing my fuel, vacuum and nitrous pressure gauges. I was bored today after playing plumber so I installed the gauge pod and gauges. The fuel and nitrous gauges are MrGasket electronic models made by Autometer. The vacuum gauge is analog. Okay, so here is the story... I took the truck out for a drive and at idle it shows that I have 54 PSI and when I go WOT the fuel pressure drops to about 51 PSI and then climbs back up to 54 PSI. I have an Fbody fuel rail that is not vacuum referenced and my fuel pressure is regulated by a Corvette internally regulated fuel filter that returns excess fuel to the tank. I turned on the Nitrous fuel solenoid and did a WOT run with the Nitrous Oxide supply valve valve turned off and the fuel pressure dropped to 34 PSI! :eek: I guess what they say about a Walbro pump not being able to support 550 HP true, that or I have one of the chinese fake knock-off pumps that I've heard about rather than a real Walbro pump. I have a Racetronix hotwire kit on my fuel pump so I doubt that I have a voltage/power supply problem.

Well im glad to hear you finally got the gauges put in..about time.j/k

So are the walbros okay for moderate power? Now I'm worried about mine....

There are generic Walbro types out there. Where did you buy your's? Mine came from Ebay and I don't know for sure if it's genuine or not.

WOW...glad to see you got the gauges hooked up...grimlins like to eat motors when you dont suspect anythings wrong

I bet it is a fake.

Allen has said many times I 255 and hotwire kit will support one.. But I was told you need an Inline Pusher Pump like the 044 that you have is what it takes to hold up to 600RWHP...

I got mine from nolimitmotorsports.net

The GSS340M-400-835

Check that the Walbro symbol is embossed in the casing and that the casing is polished, not rough. I'd email them and ask if they are 100% sure the pump is genuine and not a knock-off. Since they do have a large selection of different pumps that they sell, I would assume the pump you have is genuine Walbro. Those selling copies usually only have a couple different part numbers.

Yeah it has the walbro symbol and is polished.