mplavery Posted October 17, 2013 Share Posted October 17, 2013 I just installed Robs Bosh 044 fuel pump which I bought of him to replace my Walbro pump... Rob supplied it to me with all the hanger etc so it was just a plug n play job which we both thought However I seem to be having problems When I first started the car it run then cut out within a second which was to be expected After a few goes it seemed to be running fine ... Let it run for about 5 min then put it in the garage Was going to give the car a run today and it's doing the same when I first installed the pump It runs for 30sec then stalls ... Then will take a few turns of the key then it will start ... Leave it on idle then after 30 seconds stall again Any ideas ? Is the pump shorting out a relay possibly ? Are there any mods I need to have to run this pump My current set up is full BPU cheers guys n gals Quote Link to comment Share on other sites More sharing options...
hodge Posted October 17, 2013 Share Posted October 17, 2013 This should run perfectly as your walbro did, a pump is a pump. Sounds to me as if either the sock has fallen off, and your fuel level is lower than the bottom of the pump, or your feed line is loose/not sealed and it's letting air in. Quote Link to comment Share on other sites More sharing options...
mplavery Posted October 17, 2013 Author Share Posted October 17, 2013 Cheers hodge That's what I was thinking .. Should just be like the walbro pump Will check, I do have half a tank in there but will take it out again just to make sure Quote Link to comment Share on other sites More sharing options...
Parry_10 Posted October 17, 2013 Share Posted October 17, 2013 Take it back out and check you have knocked the small plastic box bit on the hanger off of its clips when you installed it. It may be slightly loose it may not just something ive done before and I had similar problems. Quote Link to comment Share on other sites More sharing options...
hodge Posted October 17, 2013 Share Posted October 17, 2013 Cheers hodge That's what I was thinking .. Should just be like the walbro pump Will check, I do have half a tank in there but will take it out again just to make sure Happy to help Quote Link to comment Share on other sites More sharing options...
mplavery Posted October 17, 2013 Author Share Posted October 17, 2013 Will do guys, just had another little play ... It will run and drive but as soon as you put your foot down it dies I have the battery on charge now, will take it out tomorrow Which box Parry ? The one where the float goes onto ? Quote Link to comment Share on other sites More sharing options...
TheTurtleshead Posted October 17, 2013 Share Posted October 17, 2013 Wiring damaged? Connection loose? Wiring in the car overheating? Fuel Pump ECU not man enough for the current draw of the 044? Quote Link to comment Share on other sites More sharing options...
Rob_Mitchell Posted October 17, 2013 Share Posted October 17, 2013 Seems well strange, i had a thought about the sock falling off on fitting. but obviously not that, got to be something silly mate as that setup is virtually brand new and all fitted by SRD Quote Link to comment Share on other sites More sharing options...
Parry_10 Posted October 17, 2013 Share Posted October 17, 2013 That box where the wires feed into. Looks like you have knocked it off one of the clips in that pic could be wrong but just trying to help. I did a similar thing and that was my problem. Quote Link to comment Share on other sites More sharing options...
mplavery Posted October 17, 2013 Author Share Posted October 17, 2013 Ok Parry, I will check it bud Yea seems weird Rob, I think its a air leak personally but I will take everything apart tomorrow and have a good check over Quote Link to comment Share on other sites More sharing options...
Rob_Mitchell Posted October 17, 2013 Share Posted October 17, 2013 Ok Parry, I will check it bud Yea seems weird Rob, I think its a air leak personally but I will take everything apart tomorrow and have a good check over yeah definately weird, pump was brilliant condition and removed correctly with care. Must be something silly Quote Link to comment Share on other sites More sharing options...
mellonman Posted October 17, 2013 Share Posted October 17, 2013 (edited) http://mkivsupra.net/vbb/showthread.php?272568-can-a-stock-fuel-ecu-run-a-400lph-pump-okay&highlight=fuel+pumps above its the fuel pump ecu I had the exact same thing with my walbro 400, I fitted a relay , Do the fuel pump test in the diagnoistic port B+ and fp (double check that first though) put a shot in and it will give your pump the 12v its needs Edited October 17, 2013 by mellonman (see edit history) Quote Link to comment Share on other sites More sharing options...
Pig Posted October 17, 2013 Share Posted October 17, 2013 Wiring damaged? Connection loose? Wiring in the car overheating? Fuel Pump ECU not man enough for the current draw of the 044? I would go with wiring or fuel pump ecu! 1st step IMO would be bypass fuel pump ECU to dry it and check all the wiring and earths. Maybe a relay issue? Quote Link to comment Share on other sites More sharing options...
mplavery Posted October 17, 2013 Author Share Posted October 17, 2013 Right ! Seems I have a few more checks Thanks guys, Would it be more simple to put back my old Walbro pump to see if there is a electrical problem ? I will check all this though Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 18, 2013 Share Posted October 18, 2013 The stock connector plug and socket is nothing like up to running the current demands of an 044. Two 044's usually get the pins so hot the plastic of the shells melts. It could also be an ECU / sensor thing, if it's mapped to only run the pumps with oil pressure showing, after a few seconds of cranking. But that connector for the top of the tank is not up to it.... Quote Link to comment Share on other sites More sharing options...
Ian C Posted October 18, 2013 Share Posted October 18, 2013 I had exactly the same behaviour with a brand new from Toyota UK spec pump. I sent it back and got a refund, the pump was bad and would barely trickle fuel out. Quote Link to comment Share on other sites More sharing options...
mplavery Posted October 18, 2013 Author Share Posted October 18, 2013 Well i taken the pump out, everything looks good, even taken the filter off and run it to see if it was a little blocked .. Still the same Just put my old Walbro pump and running fine now Quote Link to comment Share on other sites More sharing options...
mellonman Posted October 18, 2013 Share Posted October 18, 2013 But did you do the fuel pump ecu bypass to test its not that, its common for the ecu to not have enough power when its at the 9v power Like I said all you had to do is put a shorting wire in the engine diagnostic point fp to b+ Could of saved you alot of work Quote Link to comment Share on other sites More sharing options...
mplavery Posted October 18, 2013 Author Share Posted October 18, 2013 But did you do the fuel pump ecu bypass to test its not that, its common for the ecu to not have enough power when its at the 9v power Like I said all you had to do is put a shorting wire in the engine diagnostic point fp to b+ Could of saved you alot of work Going to look into it bud for sure, I just had to get it back in the road as I'm doing Santapod on Sunday .... I have already checked out your linky , thanks for that Quote Link to comment Share on other sites More sharing options...
mellonman Posted October 18, 2013 Share Posted October 18, 2013 Owh got ya, funny enough in my link I had to get mine sorted for a santapod how funny is that Quote Link to comment Share on other sites More sharing options...
mplavery Posted October 18, 2013 Author Share Posted October 18, 2013 Owh got ya, funny enough in my link I had to get mine sorted for a santapod how funny is that I'm guessing your going this weekend then Does not look good for weather Quote Link to comment Share on other sites More sharing options...
Chris Bailey Posted October 18, 2013 Share Posted October 18, 2013 Walbro FTW! Lol! Quote Link to comment Share on other sites More sharing options...
mellonman Posted October 18, 2013 Share Posted October 18, 2013 I'm guessing your going this weekend then Does not look good for weather No sorry mate got to work that thread was somd time ago,but if is was not for my college being semi pro football and not getting payed for his weeked games I would be there cos I love it, Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 20, 2013 Share Posted October 20, 2013 (edited) It looks like the one way anti drain back valve is missing off the 044, too. I have a car here like that. The fuel rail pressure disappears as soon as the pump stops running. It *SHOULD* retain rail pressure for hours. Quite why people take them off I don't know, maybe because they try to squeeze them into the original hanger and it's too long with it in place? They come as stock on genuine Bosch pumps. Removing them is BAD practice though, causes vapour locks and potentially bad hot or cold starting issues. People can't remove them from a stock pump as they are internal. Edited October 20, 2013 by Chris Wilson (see edit history) Quote Link to comment Share on other sites More sharing options...
Nodalmighty Posted October 20, 2013 Share Posted October 20, 2013 (edited) From my experience with 044's any pump that can draw 18amps @ 6 bar is going to require some vastly upgraded wiring with a 40amp fused relay to switch the pump (I kid you not, 30amp fuses just melt). I would pass the 044 pump on and run a Walbro 450 turbine pump. It is supposedly rated to 800 - 1000bhp (although I have serious doubts about that claim). Even so the flow graph is better in parts than a 044 (until we get up to the dizzy heights of 5.5 bar) and consumes much less current. http://www.glencoeltd.co.uk/walbro-fuel-pumps-hi-fuel-pumps-in-tank/walbro-fuel-pumps/walbro-450-lph-competition-in-tank-fuel-pump-kit-f90000267/ There was a handy pump comparison on supra forums web site. http://www.supraforums.com/forum/showthread.php?683983-Fuel-Pump-Comparison-Bosch-044-vs.-Walbro-416lph-vs.-Walbro-255lph-vs.-Supra-Denso Lyndon. Edited October 20, 2013 by Nodalmighty (see edit history) Quote Link to comment Share on other sites More sharing options...
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