Fuel pump in tank / Astra MK III
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  1. #1
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    Fuel pump in tank / Astra MK III

    Ok... I need another fuel pump that will fit inside my tank.

    Any ideas?

    Or does anybody know how much flow the standard internal pump is capable of? Have not checked that yet; but I think it will be to small for my needs.

    The standard internal pump is just going to feed a 2,5 litre catchtank, I will need a pump capabel to flow about... hmm... let's say about 200 lit/hour (free flow, no pressure).

    The main pump feeding the fuelrail is a Bosch Motorsport 044 (172 l/h at 7 bar).

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  3. #2
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    why does it need to flow 200 litres per hour ?? Does your car burn that much ? bit expensive isnt it ?

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    All I know is, there are 2 types on internal pumps.
    One is a 1 bar pump used on single point engines the other is a 2 bar pump used on the multipoint engines.
    I'm using an FSE Escort cosworth(uprated) in mine, fits perfect.

    You could also try asking AL as he has a mk III on throttle bodies.

    HTH
    Rob

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    Woooooh......dont ask me i aint got a clue.Would like to know myself
    Long time no post Rob,where ya been?

    Al

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    I'm fine AL check PM's

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    Oddball,

    The pump fitted inside the tank, feeding the catchtank, have to flow more or at least as much as the main pump. Else, with full trottle at the highway for a couple of minutes, there is a chance that the pump inside the tanke can't keep up the flow and the catchtank will soon be empty. That's no good...

    There is a chance that the inside pump could manage to flow enough fuel, because there is no pressure working against it when just flowing fuel into the catchtank. I can't get any data from Bosch about this subject, they only got data how much fuel the pump flows at a given pressure...

    The main pump will be working against a fuel pressure regulator, that results in a lower flow rate. About 4 bar fuel pressure is needed at atmospheric pressure to get the best result from the injectors. When running under boost, the fuel pressure that the pump will se is about 6 bar.

    Wise from last years experience, this engine is going to have a bit oversized fuel system that also can handle my future needs.

    I'll go for a main-pump that is good for 6 bar this time.

    I'm looking for some kind of bigger pump that easy can be fitted in the original tank.

    I almost wish I had a MKII... The pump is outside the tank. :-)

  8. #7
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    A 1 bar and 2 bar?

    Hmm... The original pump should be able to work with a pressure of at least 3 bar, the original fuel pressure regulator is at 3 bar.

    Do you got a Bosch-# on that Coswort-pump?


    Tnx.



    Originally posted by Nova_Turbo
    All I know is, there are 2 types on internal pumps.
    One is a 1 bar pump used on single point engines the other is a 2 bar pump used on the multipoint engines.
    I'm using an FSE Escort cosworth(uprated) in mine, fits perfect.

    You could also try asking AL as he has a mk III on throttle bodies.

    HTH
    Rob

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    It will probably work but will be stressed and wont last long.
    The pump i'm using isnt a Bosch item it's FSE cost 150 but well worth it! The car accelerated better, less flat spots and gave better results on the rolling road.

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    Do you have any data on that pump? Part-#?

    litre/hour (@ ? pressure).

    Is there any information avabile on the net?

  11. #10
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    I got mine from tweeks, but if you goto http://www.fuelsystem.co.uk or http://www.fuelsystem.co.uk/new_page_3.htm
    Mines the ITP048 the std uprated one I wanted wasnt good enough so I had to go for the Cossworth one.

    HTH

  12. #11
    MIGClub Member MikeWarner's Avatar
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    What do the pressures you refer to mean? Suely that can not be delivery pressure?

    The standard GTE 16v pump can supply up to 90psi (over 6 bar). I have never heard of anyone needed to uprate these except for on proper motorsport engines.
    Why is the time of day with the slowest traffic called rush hour?

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    Thanks! I'll take a look at that page!


    Originally posted by Nova_Turbo
    I got mine from tweeks, but if you goto http://www.fuelsystem.co.uk or http://www.fuelsystem.co.uk/new_page_3.htm
    Mines the ITP048 the std uprated one I wanted wasnt good enough so I had to go for the Cossworth one.

    HTH

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    Originally posted by MikeWarner
    What do the pressures you refer to mean? Suely that can not be delivery pressure?

    The standard GTE 16v pump can supply up to 90psi (over 6 bar). I have never heard of anyone needed to uprate these except for on proper motorsport engines.
    Only the pressure is kinda irrelevant, it's the flow in combination with pressure that matters.

    I don't have time to do a full-scale explanation of what I mean right now (can get back to it later with a few examples how to calculate the size of fuel system, if someone is intrested?), but in short: The pump is specifed to flow a certain amount of fuel at a specified pressure. If you exceed the specified pressure, for example to "stretch out" your injectors at a home-built turbo engine (eg using a progressive fuel regulator), the flow will decrease. And that means less fuel... Example: A pump flowing 150 ltr/hr is rated at 43 psi. If you increase the pressure to 63 psi, the flow may drop as much as 25 - 30 percent...

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    Western RC astramaxed's Avatar
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    I've got a MK3 Astra that i'm breaking and it has multipoint injection with the pump in the tank if you want it.
    There aint no replacement for displacement
    Western Region Co-Ordinator

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    Originally posted by Astra 16v SC


    I don't have time to do a full-scale explanation of what I mean right now (can get back to it later with a few examples how to calculate the size of fuel system, if someone is intrested?)
    I'm interested, might be something for the technical archive.

    Cheers
    "Undercover maniac"

  17. #16
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    Originally posted by Nova_Turbo
    I got mine from tweeks, but if you goto http://www.fuelsystem.co.uk or http://www.fuelsystem.co.uk/new_page_3.htm
    Mines the ITP048 the std uprated one I wanted wasnt good enough so I had to go for the Cossworth one.

    HTH

    This company, Fuelsystems... They aperently don't want to sell a fuelpump to me. I've emailed (no answer, as usual with companys in the UK, the only big exeption is Magnecor. Great service and fast delivery of my custom ignition leads!) and then a week later sent them a fax instead. I took a day, but did get an answer by fax...! With a flow chart, but no more info (I did request specific info about their pumps).
    I faxed back again and wanted more information, haven't heard from them since.

    Is there any other companys in the UK that (want to) sell fuelpumps and don't take weeks to act on an email/fax query?

  18. #17
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    just a quick note to add to what rob said....

    i had to change my 1.2i pump in my nova for a 2.0 vectra pump cause the pressure at the rail wasn't high enough..... the pressure with the uprated cossie pump is massive e.g. don't push the pressure test valve unless u wanna get soaked!!
    LEE69

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