1800Ti Fuel Pump ECU problem

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1800Ti Fuel Pump ECU problem

Post by philhoward » Tue Jan 27, 2009 10:24 pm

Recently posted by CNHSS1:

The ECU has a habit of burning out the fuel pump resistor. this seems to be due to the fuel pump used in the SS1/T/Sabre Ti as its not a problem on the silvias and bluebirds UNLESS an aftermarket fuel pump is used. i guess the scimitar pump pulls more current than the std in tank weedy Nissan version.
the pics below show a damaged ecu. This has been modified to use a larger wattage resistor (same resistance value as stock) which does help to redcue the overheating.
you can beef up the ecu tracks around the damaged area with thin wire and re-solder and this usually cures the problem.

Image

Image

Craig


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Re: 1800Ti Fuel Pump ECU problem

Post by AJL Electronics » Sat Feb 13, 2010 11:09 pm

Are there any other regular problems? My SST died whilst idling and fuel pump would not restart. I changed the ECU with no benefit (unless the second one was duff).

Applying volts direct to the pump makes it run. Fuse was a blown 15A that looked like it had been getting very hot, the fuse case was distorted. Still no power at the pump when that was replaced.

Looking at the circuit diagram, it seems that the ECU switches the pump motor earth feed, so in that case I can short out at the ECU for a test?

Any other suggestions?


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Re: 1800Ti Fuel Pump ECU problem

Post by AJL Electronics » Sun Feb 14, 2010 5:30 pm

The clue was in the melted fuse. Replacing the fuse again with the ignition on allowed the pump to sart intermittently. The contacts in the fusebox had widened preventing proper contact with the fuse, hence the heating.


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Re: 1800Ti Fuel Pump ECU problem

Post by td99 » Fri Mar 26, 2010 8:58 pm

Ok, so this and another post somewhere indicate that a higher wattage resistor is required. Can someone say what the resistance is and wattage should be so I can replace as a preventative measure?


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Re: 1800Ti Fuel Pump ECU problem

Post by AJL Electronics » Fri Mar 26, 2010 9:37 pm

td99 wrote:Ok, so this and another post somewhere indicate that a higher wattage resistor is required. Can someone say what the resistance is and wattage should be so I can replace as a preventative measure?
My cursory investigation suggests that the pump is either on or off, rather than modulated. If that is the case, then a relay will take the load off the ECU beautifully. If it is modulated, then an outboard emitter follower with a decent power transistor should do.


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Re: 1800Ti Fuel Pump ECU problem

Post by stewb » Sat Nov 12, 2011 6:55 pm

The feed won't be PWM - only logic. An ign fed relay pulled low by the ECU will do nicely!

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Re: 1800Ti Fuel Pump ECU problem

Post by rmc666 » Sat Jan 14, 2012 12:12 am

has the wee goz been checked in the pump on the infeed for rust particled that was the prob with mine pump overheated trying to pull fuel in now replaced with 005 pump with inline filter before pump so i can check for cloging



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Re: 1800Ti Fuel Pump ECU problem

Post by scimjim » Sat Jan 14, 2012 1:14 am

is there anyone available to translate that for me please?

:-)


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Re: 1800Ti Fuel Pump ECU problem

Post by philhoward » Sat Jan 14, 2012 8:16 am

"Check the inlet gauze for rust particles as - think that's what burnt mine out; I've fitted an inlet filter with my new pump"


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Re: 1800Ti Fuel Pump ECU problem

Post by scimjim » Sat Jan 14, 2012 11:26 am

thanks Phil :-)

if you have rust in the pump - you have water in the tank. A pre-filter will hide the symptoms but not cure the fault.


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Re: 1800Ti Fuel Pump ECU problem

Post by td99 » Wed Apr 11, 2012 8:48 pm

Harping back to the discussion re the resistor burning out, reading the S13 manual, it describes the fuel pump is driven by a relay. Wiring diagram shows that too.
Considering nearly identical ECU's on ET and DET engines, I think it's certain that a relay can be used to drive the Ti pump. Just one of the improvements I see on the DET in the weak areas of the ET.


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Re: 1800Ti Fuel Pump ECU problem

Post by peter freeman » Wed Apr 11, 2012 8:55 pm

As long as you put a fuse in the pump supply Trevor - I would measure the current taken by the pump and double the fuse value - depending on the type of fuse used of course.



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Re: 1800Ti Fuel Pump ECU problem

Post by peter freeman » Wed Apr 11, 2012 9:10 pm

Actually when I think about it I have a spare ECU in our Sabre so I will have a look at it and let you know more tomorrow - the resistor will more than likely be a fusible ( sacrificial ) one but looking at the picture posted earlier it looks like it is fixed on the circuit board - spacing it off the board will allow it to burn out without damage to the board and also keep it just that little bit cooler.



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Re: 1800Ti Fuel Pump ECU problem

Post by scimjim » Wed Apr 11, 2012 10:51 pm

The pump supply is already fused isn't it?


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Current: SE5 (8Ball), TI SS1 (snotty), 1600 SS1 (G97), 1600 SS1 (C686CCR), 2.5TD SE5a (diesel 5a), 6 x random other SS1s.
Previous: SE5, 3 x SE5a, 2 x SE6a, 3 x SE6b, GTC, 2.9i GTC, 3 x 1600 SS1, 1300 SS1, Mk1 Ti Sabre, Mk1.5 CVH Sabre
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1300 SS1 (Number One) & Sarah's coupe.
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Re: 1800Ti Fuel Pump ECU problem

Post by peter freeman » Wed Apr 11, 2012 11:10 pm

Not by itself - it shares a fuse with other circuits.



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