CheckmateScarab

Will do, just bought a mechanical oil filled 100psi gauge on Amazon, I won't be able to test until the cold is over but will keep everyone updated. Hoping it's as simple as swapping to a more powerful pump

compedgemarine

when you say it has full throttle movement is the screen showing 100% TPS? does the screen show the same 3800 rpm as the tach. also is this a new install? does it have an anti siphon valve? you may have a fuel hose failing between the tank and pump or the anti siphon is too much restriction for the pump. if all else fails get a 5 gal jug and run a new hose from it to the first filter to take the tank out of the equation and see what happens. this all assumes the fuel pressure drops off above 3500 rpm.

Griff

I don't know anything specific about the Sniper system and didn't know about it having an internal regulator.
What I posted is generally how most efi's are rigged. The external regulator bleeds off the excess fuel pressure into the return line.
Your regulator must be internal and close to the fuel return line connection.

compedgemarine

if you look at the pics above of the sniper 1 you can see the 4 screw cover on the one marked return. that is the regulator. makes for a clean install so why they chose to change the sniper 2 to require an external regulator in the return hose is anyone's guess as they do not include it in the kit so after you buy it you find out you have to order something else to finish it with.

SB

You have a phone that takes video, right ?
Or a gopro available ?

Edit in: you pull your spark plugs to see if anything is being eatin’ ?

Griff

If you put a fuel pressure tester on it and it does read low, you will still have to determine whether its the fuel pump not making enough pressure or if its the regulator opening and bypassing fuel at too low of pressure.

CheckmateScarab

I'll have to rig a GoPro to it somehow, all of my mounts are screwed into the hull, I don't want to do that to the inside of the engine room

The unit is brand new but I wouldn't be surprised if the regulator is faulty. I still suspect the fuel pump is cavitating or simply too weak / too much restriction. Thanks for the suggestions. Once the cold is over I'll hook up everything and see what the gauge reads!

LTZCrew

id check your key on pressure just to see if its even close, if its a bran new unit you need a external regulator as per the instructions.
hows your A/F sensor mounted. is its reading properly? when mine when bad it did a bunch of weird shat.

not to hard to check fuel pressure well under way, most pressure gauges give you a foot or two of line so you can route it outside the hatch and have someone watch it well you get on it

Griff

The fuel pressure tester I got from Harbor Freight similar to this one had about a 4' long hose Basic Fuel Injection Service Kit (harborfreight.com)

CheckmateScarab

I ordered an Earl's oil filled 0-100psi pressure gauge and AN adapters to hopefully get a good reading. I dropped my riser off at a shop and he installed the bung at the top of my riser clocked at 2




If my setup doesn't work I'll order this kit, priced very well.