I checked the spark with a screw driver inside the HT wire end and then grounded to the valve cover bolt (old school style).

I do not hear the fuel pump, but I've never heard the pump run unless the car sits for a few days.

I will check the fuel pump relay and try the fuel pump hammering trick and report in with the results.

I very much appreciate this advise.

Thanks,
Tim

 

Update...the fuel pump hammering trick seems to work. Sometimes need to do it up to several times and more.

The pump whirling sound should be evident every time the key is turned on position II, is this correct?

Tomorrow I will check the relay.

Thanks,
Tim

 

Watch the CEL when doing this, is it coming on for ~2 seconds and then going off?

Begining to sould like the relay, no power to pump.....let us know what the tests show. Also, you can get to the wires at the pump (without dropping the tank) for additional electrical testing.

 

I want to mention this car runs, it has a symtom where it will not start when hot and will then start after a undetermined cool down period.

I definately do not hear the fuel pump whirl on when and during the CEL on then off sequence.

The relay, does it have two functions to pressurize the fuel system at start-up and then supply power to the pump during normal operation?

Also, can someone please show me which relay is for the fuel pump. The Haynes manual is not very detaled. The relay is noted to be located above the left inside car fuse panel lower foot compartment? I did locate several relays in this area, which one is for the fuel pump?

Thanks,
Tim

 

This main fuel relay (MFR) is very high near underside of dashboard. I found on 90Ex that removing the 3 bolts supporting the cruise control and allowing to hang allowed a clear view/access to the MFR.

MFR is gray box about 2"Lx1"Wx2"D. It is mounted on a metal bracket. I found it easier to remove the 10mm bolt holding the bracke to body than separate the MFR from the bracket.

The success of hammering suggests a possible sticking fuel pump. I had this problem and it took forever to finally rule out bad MFR. You will need to confirm that 12v is getting to the fuel pump power line in the trunk every time key is turned to On. If yes, and pump is not engaging, then fuel pump must be replaced.

good luck

 

Not sure if this helps...as stated, need to confirm power to the pump....no power, check the relay. Getting power bad pump.

Please note, power to the pump when key is turned to "on" only lasts for ~2 seconds.

 

If power to the fuel pump only lasts 2 seconds. How does the car run?

Thanks,
Tim

 

When engine "starts" ECM recognizes and maintains MFR closed and fuel supply continues. This is apparently a safety feature to avoid fuel pump running when engine has stopped, as in an accident.

good luck

 

I think, I can see this relay. The lettering reads just "main relay ***'y" and its a gray box. That seems to be it, but I can't get it out.

The location and congestion of the wiring and limited space to work, make it impossible for me to get it out. Along with the 98 degrees in the shade and my eye sockets filling with sweat every 30 seconds, I'm totally exhausted....DAM IT!

At least you all helped me narrow this problem down to just a few components. My 6'-1" 215 lbs physic and 2" longer than normal arms can not worm this relay out... additionally if the fuel pump needs replacing, I will have to take it to the pros with the all the good tools etc.

I would like to thank you all for your advise and very quick responses. When all is sorted out, I will update this thread with the results.

Best regards,
Tim

 

Search v=4BQtmjovmms on youtube for a decent video on how to remove the main relay.