Konstantin

Hello
anyone has the part number for the Bosch Fuel Pup that Linsey sells?
How many HP does this support?
any pro or contra and any other sugestions?

Konstantin

IanM

Bosch part no. 0.580.254.942. It's quite a bit larger than the stock 951 pump. It's original equipment for a 1978 Mercedes 450SLC. It will fit in the stock position, with some slight modifications to the rubber/foam/whatever it is holder. I have no idea how much hp it'll support, lots though. The old Bosch K-Jetronic mechanical fuel injection that the MB used controls fuel delivery via fuel pressure rather than pulse width. Because of this, the fuel pump had to be powerful, which makes it a good upgrade for more modern Motronic cars looking for more fuel.

951Racer

You should be able do around 400-450rwhp with this pump.

rcldesign

I have a 928GTS pump - largest pump Porsche made for street cars, to my knowledge. Works great. I *heard* it'll support 800 or so HP, but who really knows.

nine-44

Will the GTS or Mercedes pump work on a stock 87 951 without problems? I'll be running in stock form until next season but need a new pump to support the swapped 951 engine in my 88 944. I don't want to buy two pumps.

Danno

"I have a 928GTS pump - largest pump Porsche made for street cars, to my knowledge. Works great. I *heard* it'll support 800 or so HP, but who really knows."

Wow, a pump that flows 25% more than the stock 951 pump can support 800hp, eh?

rcldesign

I don't know... that's just something I heard. Perhaps you didn't see the * * around "heard"? If it only flows 25% more, than that would mean a stock pump could support 640 HP (which I'll go so far as to assume it can't, and therefore the GTS pump can't support 800).... this is all assuming a 1:1 ratio of fuel flow to HP, but I somehow doubt that the ratio is exactly 1:1. In either case, the fuel pump fit in with only minor modification to the foam thinggy that wraps the fuel pump.

tecart

i have the 928 gts fuel pump too from huntley, it was supposed to give 500 hp or 450 rwhp of flow limits, it will not fit back in the stock rubber/foam insulator, as the new 928 gts pump is too big, it was easy to see that no, you cannot reuse that rubber insulator, i did the install myself and remember huntley also saying nope it will not refit so do your best to wrap it, no idea what i was supposed to do so i wrapped it in carpet padding and then duct tape, anyone else know what i mean

dmoffitt

so how much power can the stock pump support?

IanM

Yes, the big pump will work on your stock motor. It just means more fuel will be flowing back to the tank through your fuel return line out of your fpr.

Seems to me that between 350-400rwhp is about where the stock pump reaches it's limit. I think some people just upgrade because they need a new pump anyways, and the upgrade pump (at least the MB one that I got) is way cheaper than the stock one.

951Racer

What the stock pump can do will really depend on many factors. Personally, I would not run the stock fuel pump on cars over 285rwhp. You should also look beyond just the "Porsche" fuel pumps. There are pumps out there far superior to 951 or 928 ones...

Alan C.

I'm using a Weldon 2025 with -8 lines to the fuel rail and -6 lines out of the fuel rail. It'll clean out the tank faster than my ex wife elimiated the checking account.

Alan C.

951Racer

So if you have the 2025 you probably have the dial-a-flow also. That would address IanM's issue of excessive fuel circulating through the system.

IanM

What issue? I was just responding to the question queried by "nine-44" about whether a bigger pump can be used with a stock motor. My only issue is my on-going problem with fuel pressure dropping off under boost at high rpm, which was the reason for me going to the bigger fuel pump in the first place. I need to do some more tests, but I think I may now have sorted it out.

BTW, I *think* the 928GTS fuel pump Bosch part number is 0.580.464.057, for whoever is interested. Someone who actually has one may be able to confirm that. It may be cheaper to buy from your local Bosch supplier, rather than going to the dealer.

Bill

The Lindsey pump will fit in the stock location but you will need to modify the rubber insulator. The Lindsey pump is both longer and larger diameter. I used a router to increase the insulator inside diameter.