Driving down the road and engine shuts off

[Bitsyncmaster]

Any suggestions on a good one to replace it with? I've seen the "Fuel Pump 909" search on ebay one for $50 and it looks fairly easy to replace. Or is it worth it to do the the DMCH one?

When your ready, the old DMCH one was $90 when I bought mine. Now their new one seems to not have the "buzz" the old type often get when the fuel tank gets hot.

[Jimmycxc]

Yes, assuming engine isn't running.

I wouldn't buy anything just yet.

Check your ground side of the fuel pump circuit. Put the neg lead of voltmeter on batt neg terminal, and use the positive lead to probe the negative terminal of the fuel pump. Ideally the voltage there should be zero but in reality it will show some. How much it shows depends on the integrity of the the circuit connections between the pump negative terminal and the battery. Do this with rpm relay jumpered and pump running.

Enjoy! Not too hard...

Did this and it read -1.42 V

[Horsebox]

Not sure why it reads negative unless the leads were swapped....

Assuming you have +1.4V at the pump negative, you should be able to harvest another volt or so by cleaning all the connectors downstream of the pump neg terminal. 1.4V is too high for such a short wire path.

Another easy test would be to reground the pump temporarily. You could do this at the inertia switch. I don't remember which colour wire does what, the circuit diagram will tell you, but essentially one of the wires on the inertia switch connector goes to frame ground. Make a connection at this point and wire it direct to the batt neg terminal. Then remeasure the voltage you have on the pump neg terminal with pump running.

The difference between your pump neg voltage with the new temp ground, and your 1.4V, will tell you how crappy your stock ground is.

Sorry if I didn't explain very well! It's much easier than it sounds...

[dhaney]

I would look hard at the white ballast resistor. We've seen 1 fire and another almost fire because of it!

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[MML]

I would look hard at the white ballast resistor. We've seen 1 fire and another almost fire because of it!

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Whoa, seriously? Can you elaborate a bit?
Mine gets really hot, as in, too hot to the touch, but I thought that was normal?

[Bitsyncmaster]

Whoa, seriously? Can you elaborate a bit?
Mine gets really hot, as in, too hot to the touch, but I thought that was normal?

To hot to touch is normal. You would not want anything laying over those resistors that could burn.

[MML]

To hot to touch is normal. You would not want anything laying over those resistors that could burn.

Ahh thank heavens for that.

Was that the cause of the aforementioned fires?

[Jimmycxc]

I would look hard at the white ballast resistor. We've seen 1 fire and another almost fire because of it!

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That's in the engine compartment, right? Would someone please provide me with a picture just so I know I'm checking the correct item?

[DMCMW Dave]

That's in the engine compartment, right? Would someone please provide me with a picture just so I know I'm checking the correct item?

The white thing in the middle


resistor wiring.jpg

[Jimmycxc]

The white thing in the middle

Sorry its been a while. I was away for business. Not much progress...I took off each adapter and took some corrosion off. Still only getting 8.3 V at the fuel pump. Is there something I can test? Here's what mine looks like.

IMG_5451.JPG




I then made a separate ground for the inertia switch and it jumped to 8.45 V at the fuel pump. I did not try temporarily grounding the pump at the inertia switch yet. Also, here is my pump.

IMG_5450.jpg