Facet 40290 pressure issues

[dyingtolive04]

Good evening all.

I recently purchased and installed a Facet 40290 on my new-to-me '93 F350 with a 7.3 IDIT. The truck was somewhat of a basketcase when I got it, and I've been trying to work through all the issues to get it to daily driveable status. One of the issues I had was that my fuel filter restriction light was coming on while driving at anything over 25%ish throttle. Much reading on the forums suggested a Facet lift pump, either the 40222 or 40290 variety. The hot rodder in me said to spring for the higher pressure/flow pump and use a bypass regulator to bring it down to acceptable pressures, so that's what I did. I ran hard-tube adapter fittings to run -6AN hose from the frame rail to the pump. Fuel comes out of the pump and into the filter head. From the filter head it goes into the regulator, and from the regulator, it runs to another -6 to 5/16 hard tube adapter into the injection pump. The bypass/return runs off of the regulator and T's into the return line off the back of the engine. My thought in running the regulator between the filter head and the IP was so that I could still use the Schrader valve on the filter head to bleed air on priming- which worked great! My problem is that according to the gauge mounted on the regulator, I'm seeing no more than 8psi of pressure regardless of regulator adjustment, which is fine by me. The issue is that as soon as I crank the truck, fuel pressure drops to zero on said gauge, and the bowl on the pump is almost empty. Perhaps I'm not quite understanding how this assembly works, but it would seem to me that if my regulator is bottomed out and seeing 8psi, I'd still see 8psi at idle, no? Pressure stays a constant zero at idle regardless of whether the bypass/return off the regulator is blocked/pinched off or not.... Am I missing something here? Or did I screw something up? Thank you in advance

 

[Kdo58]

Facets don't have enough volume for a turbo motor, not saying that's your problem.

 

[asmith]

The quality in the facet pumps has really fallen off and as Kdo58 said they cant really keep up with a turbo very well. They are not really recommended anymore because of that. The older ones used to somewhat keep up, but it seems pretty much all the newer ones have issues and dont deliver.

Teeing into your return lines from a regulator can also cause issues with how your truck runs. It puts too much pressure in the return system and can mess with your timing.

 

[dyingtolive04]

Well. In that case, what seems to be the go-to pump these days?

Also, where else would you run the return to? Sure, you could run it all the way back to the tank, but then what happens when you switch tanks? I wouldn't have thought that teeing in to the return at the very end of the system should've messed with return pressures that much. I do understand the principle of changing injection timing with pressure in these engines, but I thought that had more to do with the supply pressure, no?

 

[IDIBOBS]

I’d put it all back to stock and fix any air intrusion issues. The stock pump and s cheap, easy to replace and worked great on the trucks for 40 years.

 

[Clb]

Verizon lost our beloved imogie in a data transfer...
Perhaps the search function would pop up similar posts....
Carryon

 

[dyingtolive04]

I’d put it all back to stock and fix any air intrusion issues. The stock pump and s cheap, easy to replace and worked great on the trucks for 40 years.

Too late for that now. I've already cut the lines and switched over to hard tube fittings. In theory, this setup should work, no?

 

[dyingtolive04]

Verizon lost our beloved imogie in a data transfer...
Perhaps the search function would pop up similar posts....
Carryon

I did a little bit of digging before making the initial post. Admittedly, it was a fairly cursory glance and went ahead and posted up when I didn't see anything right off.

 

[dyingtolive04]

Some pictures of the setup if that's helpful..

 

[Black dawg]

How much fuel is going out the return on the filter head?.....

 

[klook]

I thought I read somewhere that these pumps dont like to lift or suck, they push. I mounted mine down on the frame rail where the tank easily feeds it. I have struggled with consistency with pressures also. I measure mine where the schrader valve used to be. In the morning I have good pressure and it runs great. By the late afternoon it is dropping and performance suffers. I have the 40222.

 

[dyingtolive04]

How much fuel is going out the return on the filter head?.....

To test that, I need to remove the return line running from the filter head that tee's into the injector return lines, correct?

What is the amount I'm looking for? Something like a quart of fuel in 30 seconds or something like that? Engine running, I assume?

 

[dyingtolive04]

I thought I read somewhere that these pumps dont like to lift or suck, they push. I mounted mine down on the frame rail where the tank easily feeds it. I have struggled with consistency with pressures also. I measure mine where the schrader valve used to be. In the morning I have good pressure and it runs great. By the late afternoon it is dropping and performance suffers. I have the 40222.

If that's the case, it kind of defeats the advertised "10 feet of vertical lift" doesn't it? Haha

 

[klook]

It might lift 10 ft but maintain what pressure? Mine is unregulated and the maximum I see is 7 psi with negative lift.

 

[dyingtolive04]

It might lift 10 ft but maintain what pressure? Mine is unregulated and the maximum I see is 7 psi with negative lift.

So again, I'm seeing about 8psi with the engine off. Engine running, it drops to zero and the bowl seems near empty. I'm not saying that couldn't be part of the issue, but I want to try to rule out any potential issues with the filter head and everything else before I move the pump. AN hose ain't cheap these days.