I know the motor gets stupid hot, but haven't checked the wiring so I'll do that today!

So splice the ground wire and mount to frame near the pump yeah?

Good info brother, thank you 🙂

 

DF-165 4g and probably 10 years old or so, but new 4g motor last summer.

 

Yeah bro check that wiring. IIRC the wiring included was like 16 AWG or some stupidly inept gage for that type of function.

I split it, sealed it and grounded right to the frame.

 

Ok that is where my confusion lied.

 

Just called AD again and I thought my base style was a DF-165 4g, but it's just a DF-165 and the replacement motor I purchased last summer is a 4g so the return line base fitting is 1/8 NPT to 1/2 barb/hose fitting so now at least I know what to look for thankfully

EDIT: I said screw it and just ordered a new DF-165 4g bottom half and all fittings for it which they have the return fitting for it so easy peasy and when all done I'll have a brand new lift pump, fittings and hose installed and I'll upgrade the wiring when I replace the bottom half of the unit.

 

I think I used something like 4 Ga on mine. I ran a wire directly from the positive of the driver side battery to a 45A relay and then from the relay to the airdog. I tapped into the factory fuel pump wires to trigger the relay so I could use the key to start it. It's still going today with 325K miles on it, as is the original Aeromotive fuel pressure regulator mounted to the alternator. The truck had 400K on it when I talked to the other owner Friday.

 

Same thing I did, and I believe it was it your advice I took.

 

Geez, the factory HFCM pump runs on 5a.

 

When I turn key to on position with engine off the AirDog pump runs continuously and I'm figuring it's not supposed to eh? Darn good way to drain the batteries when doing FORSCAN stuff.

 

No find the wire from the HFCM that runs off of oil pressure reference and use that to trigger the relay, once there is no oil pressure for I believe 10- 15 seconds it shuts off. The above post is what I meant I did, not alter it into a HD relay or anything like that. I wanted to clarify and I used 8 AWG once I looked at the harness I had left over. Sorry for the misinformation.

 

That would concern me, should shut off after a bit. Hopefully is still wired through the rollover switch

 

Baylinerchuck ]Just thinking out loud here. Turning on the AC also will kick in the fan to a certain extent. The fan is commanded by the ECU. Could the fan be causing an issue with the VREF which is shutting down the engine?[/QUOTE]

I think when we get to the end of this Baylinerchuck has the answer

 

If wired per the instructions, no it will not shut off. When the key is on, its on.

 

I thought it had something to do with the AC as the first time it ever died on me was just after getting freon put it and running it on max AC, but engine has died when not running the AC at all, died in +40 daytime heat and died at night in the cool mountain air so I believe the issue is either fuel regulator/AirDog/ units getting too hot or the fuel system is sucking in some air and causing issues when fuel temps get up there.

The other day I put goops and gobs of dielectric grease around all the fuel line fitting where air could get sucked in and then I purged the system by loosening the main fuel filter then turning pump on and I let a good 1/4 gallon of fuel drain out before I twisted the filter back on and immediately after the pump doesn't sound as loud and fuel pressure went up from 62 to 64 and it's stayed there so far after 150kms or so of spirited driving so most likely just a band aid fix for now.

I'm going to be redoing all the fuel lines and fitting right from the tank to the stock fittings under the drivers side and also replacing the older AirDog base unit with the updated 4g model AND I'm going to rewire the pump to the battery with heavier gauge wire and HOPEFULLY that will end this once and for all.

Fuel lines around engine and regulator are insulated now and up pipes/down pipe will be fully insulated as well here shortly so crossing my fingers all this work/cash spent will be worth it lol.

 

Ok good to know that it's normal then, thanks man