Fuel delivery issues fj60 with 6.0 vortec

[Shebamacalla]

The PO that did the vortec swap in my cruiser used a fuel pump mounted on the frame rail and braided lines with AN fittings. I’ve had issues with it since owning it now for almost 5 years to the point it gave up on me climbing mountain passes in co. I swapped the fuel pump in a parking lot and was able to continue my trip but the new one isn’t much better. I get what I believe is vapor lock from time to time and I recently got a leak where the pressure regulator goes into the return fuel line. I replaced that AN fitting which stopped the leak but then I noticed the fuel pressure was at 90psi when if I remember correctly it used to be at 60psi.

Long story short. I’m thinking about redoing the whole thing to hopefully save myself from these issues in the future. Can I use a fj62 fuel pump in the tank with this set up to get away from the pump mounted on the frame rail? Any reason why people don’t do that? It seems like most people use the frame mounted pumps which overheat and make a ton of noise? Maybe the 62 pump isn’t compatible with the 60 series tank?

Thanks for any insight!

 

[tmxmotorsports]

Dont go back with the frame mount pump dont use the nla fj62 fuel pump module

 

[tmxmotorsports]

If you have a 60 tank drop it get a hole saw drill a hole where the 62 fuel pump module would be and put a tanks inc. Fuel pump module in it

 

[KWalkerM]

Ha. I have the exact same issue with my Vortrc. The best option is to run an in tank pump.

 

[KWalkerM]

The PO that did the vortec swap in my cruiser used a fuel pump mounted on the frame rail and braided lines with AN fittings. I’ve had issues with it since owning it now for almost 5 years to the point it gave up on me climbing mountain passes in co. I swapped the fuel pump in a parking lot and was able to continue my trip but the new one isn’t much better. I get what I believe is vapor lock from time to time and I recently got a leak where the pressure regulator goes into the return fuel line. I replaced that AN fitting which stopped the leak but then I noticed the fuel pressure was at 90psi when if I remember correctly it used to be at 60psi.

Long story short. I’m thinking about redoing the whole thing to hopefully save myself from these issues in the future. Can I use a fj62 fuel pump in the tank with this set up to get away from the pump mounted on the frame rail? Any reason why people don’t do that? It seems like most people use the frame mounted pumps which overheat and make a ton of noise? Maybe the 62 pump isn’t compatible with the 60 series tank?

Thanks for any insight!

Alright. So I fixed my issue so I thought I would update this. Run your pump as far back as possible on the rail while being low on the frame. I found out that my rear footwell heater lines were just close enough to the pump to cause it to heat up and cause vapor lock and cavitation. I relocated the pump back and not only have better flow since I am not pulling fuel from the tank as far but my pump is also 100x quieter. I also moved the fuel pressure regulator forward where the heater lines go up towards the body to keep heat off it.

So far the pump is cold to the touch after running and I am seeing much faster fuel prime from sitting. You might be starving the pump and creating heat by asking it to pull fuel too far from the tank. These pumps like pushing fuel more than they like pulling it.

Pics attached of my set up.

 

[Shebamacalla]

Alright. So I fixed my issue so I thought I would update this. Run your pump as far back as possible on the rail while being low on the frame. I found out that my rear footwell heater lines were just close enough to the pump to cause it to heat up and cause vapor lock and cavitation. I relocated the pump back and not only have better flow since I am not pulling fuel from the tank as far but my pump is also 100x quieter. I also moved the fuel pressure regulator forward where the heater lines go up towards the body to keep heat off it.

So far the pump is cold to the touch after running and I am seeing much faster fuel prime from sitting. You might be starving the pump and creating heat by asking it to pull fuel too far from the tank. These pumps like pushing fuel more than they like pulling it.

Pics attached of my set up.

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Just seeing this reply now, looks like it might be worth a try to redo mine similar to this to see if it helps me as much as you. Any idea why my fuel pressure would have jumped to 90psi with the engine running, it drops back to 60psi on the gauge when the engine is off.
I read in a different thread about someone having a similar issue that having a high pressure filter before the pump can cause an issue with the pump, I believe I have a filter before and after the pump but I am not sure if they are "high pressure" or not.

When this issue first cropped up I figured it was because the pump was routed just a few inches from the muffler on the inside of the frame rail. I moved it to the outside of the framerail and that made no difference, so I feel like it isn't heat related at least near the fuel pump.

Another quirky thing which may be related, when I start the car it takes a couple tries before it starts on most of the time. I thought it might be because the fuel vaporized by heat soak after turning the engine off, but at this point I have no clue

 

[Willard]

Not sure on the fuel pressure. Bad regulator?

Which side of the vehicle is your pump mounted on? Most normal seems to be on the passengers side as the OEM muffler is on the driver side (US vehicles). Of course dual exhaust throws that out the window.

I would still opt for a in tank pump, if the pump is getting hot from use or a heat source, you will have a constant problem.

 

[MANUCHAO]

Best thing you can do is run an fj62 fuel tank, or as stated above get an intank fuel pump... i ran an fj62 tank for two years without issue, and only swapped the pump in the tank for one that provided the 58 psi for the vortec.... until i went for a custom fuel tank with a gm fuel pump....
Also, i run one filter the wix 33737 it is also a regulator...
Inline fuel pumps can be temperamental

 

[KWalkerM]

The p

Just seeing this reply now, looks like it might be worth a try to redo mine similar to this to see if it helps me as much as you. Any idea why my fuel pressure would have jumped to 90psi with the engine running, it drops back to 60psi on the gauge when the engine is off.
I read in a different thread about someone having a similar issue that having a high pressure filter before the pump can cause an issue with the pump, I believe I have a filter before and after the pump but I am not sure if they are "high pressure" or not.

When this issue first cropped up I figured it was because the pump was routed just a few inches from the muffler on the inside of the frame rail. I moved it to the outside of the framerail and that made no difference, so I feel like it isn't heat related at least near the fuel pump.

Another quirky thing which may be related, when I start the car it takes a couple tries before it starts on most of the time. I thought it might be because the fuel vaporized by heat soak after turning the engine off, but at this point I have no clue

What fuel pressure regulator are you running?

The priming issue is more than likely lack of a check valve so the line has to re-prime. This happens to me on hot restarts rather than in the morning since I dont have a check valve to keep pressure from bleeding off while sitting.

 

[NCFJ]

I agree with posters above suggesting an in tank pump..I'd also go with the "corvette filter" that also has the regulator built in.

Tanks Inc, pump with tray.

This is the regulator/filter Tanks Inc also has this part

 

[dcoy]

Trying to get my rail pump to reliably provide the high pressures my Vortec required was a nightmare. In situations with high altitude, temperature, and fuel demand I would get cavitation and a "vapor lock" like situation and my engine would shut down and leave me on the side of the road similar to what is described above. Switched to the in tank setup from Tanks Inc and I haven't had fuel supply issues since. I tried various Rube Goldberg approaches such as dual fuel pumps that I could switch from one to the other on the fly from the dash which were pretty useless prior to this definitive fix.

 

[FJ60Cam]

The Tanks Inc module without the tray is perfect for a 60 tank as it already has a tray from the factory.

I’m a Tanks Inc dealer if you need any assistance. Shameless plug —> https://www.mosleymotors.com/intank-fuel-pump-modules