Bosch EFI fuel pumps info

[chimpboy]

I found this info useful when sorting out an EFI conversion - upgrading a Range Rover V8 by replacing the holley carby with EFI gear from a 1990s Discovery.



The original document is a .pdf and I can email it to anyone who wants it.

It also says:

Purpose and Function

Modern EFI fuel systems circulate as much as 200 litres per hour
(~ 3 litres / min ) of fuel at pressures between 2.5 - 3.5 bar ( 250 - 350 kpa )

Modern electric fuel pumps are “Positive Displacement” type pumps, this means that the pump cannot produce pressure unless it is acting upon a restriction. The only restriction in the system should be the fuel pressure regulator. The regulator controls the system pressure; the pressure ability or flow volume capacity of the fuel pump will not alter the system pressure. Due to the high pressure and volume requirements placed upon these pumps, manufacturing tolerances are extremely fine. Motor speeds can be as high as 10,000 RPM and the clearances within the pumping elements down to microns. Cleanliness of the fuel system is vital, with an efficient high quality filter as an essential part of the fuel system.

FUEL PUMPS

Important Note.

• Bosch Fuel Pumps have their flow rates defined in N-Heptane as part of their engineering specification. N-Heptane is a pure chemical and does not have the same viscosity and density as standard petrol. Hence the N-Heptane flow rate figures stated should be used as a general guide for comparison purposes only.

• Bosch Fuel Pumps are designed for use with standard grade petrol. Subject to statutory warranties, Bosch does not warrant the performance characteristics or specifications of these fuel pumps if they are used with Alcohol or Ethanol based fuels or fuel additives that are corrosive.

The Bosch pumps are usually referred to by the last three digits, hence you will find the "044" pump on ebay a lot. You will also find the "023" which is the nearest open-bottom equivalent (for in-tank use). I saw one seller advertising the 023 as the 044's "big brother" but it's obvious fro9m the specs that this isn't correct at all.

Bosch don't specify horsepower for their pumps but from what I have seen the general view is that a 910 is good for 450bhp and an 044 is good for around 800bhp. I do not know whether these figures are reliable.

I obtained a 909 for next to nothing from a BMW at a pick-a-part. It should really be up for anything in a typical 4WD and is a lot cheaper than $200 for an 044. I adapted the mercedes bracket as well to make a pump/filter combo that is connected with banjo fittings, so it is pretty compact and fits where the old carby pump used to be. By using a filter that has M12x1.25 threaded fittings, I was also able to add a generic fuel pressure gauge (ebay for ricers, honda civics etc use this type of filter connection).

Anyway, I just thought this might be a useful reference for someone!

[chimpboy]

I also found these flow charts online; from http://www.lucasinjection.com/bosch_and ... _pumps.htm and I think this might be original bench testing so it's quite cool.

Also,

From what I am told, the 0 580 254 044 and the B 261 205 413 are the same pump; Bosch tests the "044" to qualify it to be called a "413" (see flow chart)

[MattF]

The original document is a .pdf and I can email it to anyone who wants it.

Any chance I could appropriate a copy of that? E-mail address is: mattf@bauchan.org

Cheers.

[chimpboy]

The original document is a .pdf and I can email it to anyone who wants it.

Any chance I could appropriate a copy of that? E-mail address is: mattf@bauchan.org

Cheers.

Sent.

Looking at your page... I also have a PDF workshop manual for the Triumph Stag if you wanted to add it. I am assuming you are just collecting all the PDF goodies you find. Let me know.

[Kitika]

Is there a way to quieten down the 044? Mine is loud as! Or do they 'bed' in alittle over time? Also where do you get the fittings from? I couldn't find them anywhere and had to get them off ebay because of the odd metric thread.

[chimpboy]

Is there a way to quieten down the 044? Mine is loud as! Or do they 'bed' in alittle over time? Also where do you get the fittings from? I couldn't find them anywhere and had to get them off ebay because of the odd metric thread.

I've never handled an 044 but all of the other "big" bosch pumps I've handled were really quiet, just a hum. They do need to be isolated on rubber mounts otherwise they'd make a lot more noise.

Not sure on fittings, I used (on a 909, not an 044) the banjo fittings that came with the pump. I have a short steel pipe (banjo both ends) from pump to filter, using the common jap filter type that takes banjo bolts. Other end of the filter is a banjo fitting with a fuel pressure gauge threaded into it. These are M12 as well, but they are M12x1.25 instead of M12x1.5 like on the pump. So the banjo pipes are the same but the banjo bolts are different.

[zackde]

Is there a way to quieten down the 044? Mine is loud as! Or do they 'bed' in alittle over time? Also where do you get the fittings from? I couldn't find them anywhere and had to get them off ebay because of the odd metric thread.

Hi Kit a good mate has a custom fuel system in a commodore that runs twin 044's and they are noisy!! especially when the tank starts to get low. He thought something was wrong but comments from the shop he bought it from were thats normal for the 044. For your fittings you can get them here.

http://www.efihardware.com/index.php

[mnemonix]

My 044 was noisy as (louder than the engine at idle) When it had a restrictive fuel filter on the inlet side.

I relocated the fuel filter and added a stronger lift pump to supply the 044/surge tank, and now the 044 is silent.

[Kitika]

Ahh that might be my problem with the efi filter sitting before the pump. What type of lift pump are you using mnemonix? Mines a holley copy which supposedly pumps 200lt/H to match the 044 but I get starvation issues after a good run... Trying to diagnose the problem but having 2 separate pumps+filters+regulator makes it alittle difficult. I have rubber mounted it but may use a thicker rubber or something to shut it up even more if trying all the other things don't.