bosch fuel pump setup..

[MWP]

factory regulator should be more than adequate - and easier to setup

You sure?
If he used two 910's in parallel, they might move more fuel than the factor FPR can flow, meaning too much pressure.

Renxun... first thing you should do is buy an EFI fuel pressure meter!
Then youll be able to test for all these things when you change your setup.

[BMWTurbo]

This may or may not be of interest to you, but I flow tested my little copy Walbro pump the other day at 70 psi and was getting 3.2L/min... Which is roughly enough fuel for 600fwhp.

I was also getting 3.8L/min at 60psi.

Have you looked into perhaps running a couple of these in parrallel?

It did draw just over 10amps at this load though. All testing at 12volts, so supply would go up slightly at alternator running voltage.

[thechuckster]

MWP: only a guestimate - but if the ID of the valve section of the FPR is close to the same as the ID of the connecter on the fuel rail, it should flow as much as the rail normally does?

But valid point that i missed - +ve you.

But... when under boost, it's the ability to hold back fluid volume - not allow it to pass - that's going to save the engine. Running rich off-boost will be a tuning irritant, running lean on boost is engine-death.

[MWP]

MWP: only a guestimate - but if the ID of the valve section of the FPR is close to the same as the ID of the connecter on the fuel rail, it should flow as much as the rail normally does?

Depends on the manufacturer and internals i guess.
I wouldnt take the FPR inlet ID as a guarantee that itll flow a certain amount.

But... when under boost, it's the ability to hold back fluid volume - not allow it to pass - that's going to save the engine. Running rich off-boost will be a tuning irritant, running lean on boost is engine-death.

Very true!

[oldcorollas]

easy way to test is to run the pumps, in parallel, with the engine off, and watch the fuel pressure.. if it stays steady at tyhe set amount, FPR is fine.

[chris davey]

Why not get a low volume high flow pump to replace one of the 910's that currently feeds the surge tank.

Then if your surge tank doesn't already get another fitting put on the bottom and use the 910 that was feeding the tank as a feed to the fuel rail. Run another fuel line and then y -piece them together before the fuel rail.

Fuel hose is cheap, the holley type pumps are pretty cheap and the fittings are pretty cheap.

Or you could just ditch the 910's all together and run a single 044 and holley pump. 044's can be had for about $230AU on ebay.com.au. That setup is good for over 500rwhp.

[PHOBIA]

I had a drama with my 044 not supplying enough fuel under load. I was using the original fuel pump loom at the time. I wired in a relay to run a direct feed from the battery to the pump and the problem was solved. Might be worth testing.....

[DX20VT]

I had a drama with my 044 not supplying enough fuel under load. I was using the original fuel pump loom at the time. I wired in a relay to run a direct feed from the battery to the pump and the problem was solved. Might be worth testing.....

I agree,

Sound to me like you are saying you require a damn huge amount of fuel.
Voltage drop severly affects pump output,
and factory pump wiring can be crap.

Hotwire the pump with a decent size cable and retest before spending too much money and time patching over a problem rather than fixing it.
Make sure you run a good new heavy earth as well as a power feed.

It should give you a good idea if voltage is a problem or not.

[renxun]

oh .. for the wiring .. since i had relocate the battery to the rear i had since using the relay to get direct feed from the batery and my earth is going back direct to the negative terminal of the battery.. and for the setup now im running parrelel..

oh ya... about the seriel connection ... i went to the mercedes service centre n noticed those benz with chasis code 124 run both exact same model of pump in seriel connection ... and its a 950 model... couldnt find the information on the internet about it ... they just state that it must be 2 pumps working together...

[bk_]

bosch 911 is rated for 95 L/hour. this is replacement model for bosch 950.
bosch 910 is rated for 135 L/hour. (two australian sources claim 200 L/hour which I think is wrong)

911 are used in dual pump configuration only, according to bosch application guide. Series or parallel... I don't know. I'd have to ask a mercedes mechanic guy that I know. I've had a mercedes for yonks and never knew this. Is this mercedes' way of implementing dual speed? My car has a single 910 pump powering the 1jz. No idea if it _originally_ had the 910 since previous owner upgraded it.

My only suggestion (like MWP) would be to get/borrow fuel rail pressure gauge. Useful if you have a mechanic friend (I once borrowed a fuel pressure gauge to rule out an possible problem). No point buying replacement parts if you haven't diagnosed what is _causing_ the problem. Finding the source of the problem is the most difficult task/skill; solving it is relatively easy.

PS. where abouts is your oxygen sensor located? narrowband or wideband+controller?

-BK.

[renxun]

i placed my oxygen sensor right behind my turbo... the place where the exhaust pipe begins..its a narrow band sensor.. but im using a peak ratio monitoring device.... which measures in gamma..i dont opt for wide band sensor as i aint using digital device to do remapping of my fuel map or ignition and since im using analogue devices for my fuel control i only measures the peak... it only consist of a few readings... (after i convert to voltage it will be 13.36,12.78,12.25,11.76,11.30) as long as i could maintain at my 3rd and 4th indicator readings then im quite safe...even if realised that the 1st indicator was indicated it still not too late for me to do any tuning correction...as long as i stay within the range....nothing much to brag about.. its just that my place here are not as advance as other parts of the world.. have to live with it anyway