Q45 NOT STARTING!

[mayorofbuckhead]

Thx Maxnix! I appreciate everyone! I've always liked that car so I really want to push it every now and then!

[fnomena]

Luckily for me my fuel pump didn't crap out and hopefully it won't no time soon.

[fnomena]

Luckily for me my fuel pump didn't crap out and hopefully it won't no time soon.

I found this information when searching for info on the FPCU from another forum:

"When your Q45 dies in the middle of nowhere, you merely remove the reartrunk fiberboard bulkhead; unclip the white fuel pump control unit harnessconnector; jump the correct wire to ground; and voila! You're on yourfeet again!

Back at the farm, if you follow the factory shop manual, you'llcorrectly diagnose the burned-out fuel pump control unit (aka the fuel pumpmodulator); but you'll likely conclude the old fuel pump was good (it stillworks). Second opinion is that the old fuel pump is what burned out the Q45fuel pump control unit in the first place; so, you're in for a repeat episodeof chronic fuel-pump 'modulitis' if you follow the FSM prescription.

The recommended prophylaxis is to resolder & reinforce the fuel pump controlunit ground cnnections and to perform a fuel-pump'ectomy."

Maxnix do you think I should change out my fuel pump?

[maxnix]

Maxnix do you think I should change out my fuel pump?

Without a doubt! Excessive current draw is what causes the FPCU to fail.

Read TexasOil's, Q45tech posts on the subject and Tangalora's excellent diagnosis and replacement thread.

All the information you need is in these posts. FPCU almost never fail (yet to documented here, anyway) without fuel pump failure.

If you do your homework completely, you will find Q45tech had a recalcitrant one, but it was used.

New O ring mandatory, as is steam cleaning the tank if there is any corrosion or even a slight film. Fuel filter also.

[fnomena]

Thanks Maxnix!