Return Style Fuel System Regulator/ Issues

[Not2Day]

Fore 1Le single regulator system here, needle does the same thing. logs look fine plenty of fuel
pressure, I have been sending it for about 2 months with no issues.

Pulse seems to be from the di pump is all I can come up with.

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[WonderDud]

Update: The return line started hammering hard when going to e85, switched the 6v signal from fpdm from the 2 267's to the single 285 I had originally planned to keep on a hobbs. Im thinking maybe one of the 267s took a crap and maybe the single one wasnt producing enough pressure to keep the diaphragm full. Ill do some testing as soon as possible and let yall know. Thanks for all the responces and suggestions.

Both 267's are brand new, less than 500 miles on them. Hoping this isn't the case, but it very well may be.

 

[LethalPerformance]

Brandon,
keep us in the loop. I was going to mention that pulsing could be a dying pump (or it could be a by-product from the DI portion). We've also seen customers who pieced together a system have a restriction post-regulator that was causing the pulsing (think of it as it was trying to yield more output but was unable to do so). I think the pulsing in this case is still from the DI, but it could be fixed with a larger diameter line (or if its like a restrictive 90 out, going to a straight fitting).

Just things to think about.. but I would bet it on the pumps if you tested one to be dead. You could put the two *good* pumps on all the time to test that theory.

 

[WonderDud]

Brandon,
keep us in the loop. I was going to mention that pulsing could be a dying pump (or it could be a by-product from the DI portion). We've also seen customers who pieced together a system have a restriction post-regulator that was causing the pulsing (think of it as it was trying to yield more output but was unable to do so). I think the pulsing in this case is still from the DI, but it could be fixed with a larger diameter line (or if its like a restrictive 90 out, going to a straight fitting).

Just things to think about.. but I would bet it on the pumps if you tested one to be dead. You could put the two *good* pumps on all the time to test that theory.

Appreciate the response, this is a 15 car so I’m strictly port injection. The restriction in the line could be plausible although, this is a 10 feed 8 return system and there are no 90* turns or heavy bends on the return side. Maybe plausible and I will for sure test 2 good pumps on to check. I will let y’all know!

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