Wishin' I was fishin'...
1990 Ranger 374v
1996 175 HP Mariner - Magnum EFI
25p Tempest - A45 model
80 lb 24v MinnKota Maxxum
Humminbird Helix 10
Humminbird Helix 7
Garmin EchoMap 106sv w/ LS
Dual 8' Power Poles
part of bleed system ,common problem that happens when pump is repaired its not a oil line
.................................................. ...the scariest thing in life is the unknown ...................................
Thanks for the response Joe.
the issue that I’m experiencing is my fuel system won’t hold pressure for very long, and I have to keep priming the bulb. Was checking the fuel pump and noticed this hose. Do you think it’s related to fuel pressure?
Wishin' I was fishin'...
1990 Ranger 374v
1996 175 HP Mariner - Magnum EFI
25p Tempest - A45 model
80 lb 24v MinnKota Maxxum
Humminbird Helix 10
Humminbird Helix 7
Garmin EchoMap 106sv w/ LS
Dual 8' Power Poles
Not likely- but needs to be fixed.
Is the engine running poorly or starving for fuel?
Keep in mind- you pump the bulb putting the fuel INLET line under PRESSURE.
Once the pump begins to pull through the line, it comes under LOW pressure (also known as vacuum). Bulb may not remain hard after engine has run (but should still have liquid fuel in it).
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
The engine is running good...just loses fuel pressure occasionally; especially later in the day after she warms up. Sometimes I am idling around graphing and fuel pressure will drop and she will die. I prime the bulb (about 25 times) until it is hard and is good to go...sometimes for a few minutes...sometimes for an hour.
I've replaced all of the fuel hoses from the motor to the tank ( purchased through European Marine), have had the ECU rebuilt, but have since had this issue with fuel pressure loss. Every once in a while I can be WOT and it will just die...starved of fuel; but once I prime the bulb again, good to go.
I purchased the diaphragm kit to rebuild my fuel pump, but after disassembly, decided the newly rebuilt pump was fine...that is when I noticed the hose behind the fuel pump.
Last edited by Hez; 05-09-2022 at 07:11 PM.
Wishin' I was fishin'...
1990 Ranger 374v
1996 175 HP Mariner - Magnum EFI
25p Tempest - A45 model
80 lb 24v MinnKota Maxxum
Humminbird Helix 10
Humminbird Helix 7
Garmin EchoMap 106sv w/ LS
Dual 8' Power Poles
was pump rebuilt with OEM kit,no rubber check valves used ?????? much heavier diaphragm material
.................................................. ...the scariest thing in life is the unknown ...................................
Your symptoms are indicating one of the following:
-Fuel supply RESTRICTION
-Air Leak between fuel level in tank and pulse pump
-Weak Pulse Pump (assembly order, cupped/leaking check valve, diaphragm problem)
-Weak PULSE to one side of pump (gasket leak, bad reed, mechanical problem on driving cylinder).
Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor
Yeah, I have been chasing this issue for a while. Like I said, I've replaced all of the lines from the motor to both tanks...checked for anti-siphon valves, rebuilt the fuel pump, replaced the fuel switch when I first got the boat, so it is fairly new; I even had a mechanic suggest the pickup tubes in the fuel tank, so I removed those and checked those...they were good too.
I might as well rebuild the fuel pump again since I have the assembly here, just in case its something naked to the eye. I have the manual and assembled it based on that the first time, but I will make sure I pay close attention. Is there any part of the process that is commonly screwed up?
A fuel restriction is always possible, so is a bad reed.
Wouldn't I notice gas in the cowling if it were a gasket leak?
As always, thank you for taking the time to answer mine and everybody else's questions as much as you do.
Wishin' I was fishin'...
1990 Ranger 374v
1996 175 HP Mariner - Magnum EFI
25p Tempest - A45 model
80 lb 24v MinnKota Maxxum
Humminbird Helix 10
Humminbird Helix 7
Garmin EchoMap 106sv w/ LS
Dual 8' Power Poles
gaskets in right places ,check valves laying flat not distorted , fuel pump gaskets can leak internaly in pump never see a drop outside pump
.................................................. ...the scariest thing in life is the unknown ...................................
Have you ever had a fuel pressure gauge connected to test pressure when this is happening?
Mercury 2002 200hp Carbed Saltwater
OT566776
2002 Cape Horn 22' Bay
Wishin' I was fishin'...
1990 Ranger 374v
1996 175 HP Mariner - Magnum EFI
25p Tempest - A45 model
80 lb 24v MinnKota Maxxum
Humminbird Helix 10
Humminbird Helix 7
Garmin EchoMap 106sv w/ LS
Dual 8' Power Poles
Wishin' I was fishin'...
1990 Ranger 374v
1996 175 HP Mariner - Magnum EFI
25p Tempest - A45 model
80 lb 24v MinnKota Maxxum
Humminbird Helix 10
Humminbird Helix 7
Garmin EchoMap 106sv w/ LS
Dual 8' Power Poles
Wishin' I was fishin'...
1990 Ranger 374v
1996 175 HP Mariner - Magnum EFI
25p Tempest - A45 model
80 lb 24v MinnKota Maxxum
Humminbird Helix 10
Humminbird Helix 7
Garmin EchoMap 106sv w/ LS
Dual 8' Power Poles
wouldnt waste my time on it , see pm
.................................................. ...the scariest thing in life is the unknown ...................................
Wishin' I was fishin'...
1990 Ranger 374v
1996 175 HP Mariner - Magnum EFI
25p Tempest - A45 model
80 lb 24v MinnKota Maxxum
Humminbird Helix 10
Humminbird Helix 7
Garmin EchoMap 106sv w/ LS
Dual 8' Power Poles
I also found a leak in the part circled in the image below:
A video of the leak:
https://www.youtube.com/shorts/8RqvvTCUkZo
Wishin' I was fishin'...
1990 Ranger 374v
1996 175 HP Mariner - Magnum EFI
25p Tempest - A45 model
80 lb 24v MinnKota Maxxum
Humminbird Helix 10
Humminbird Helix 7
Garmin EchoMap 106sv w/ LS
Dual 8' Power Poles
loose those screw clamps on them fuel hoes be sure its not hose spraying on that reg or o ring those are $$$$$$$$ ^^^^^^^ , 8276943 hoes kit nla ,8140122 regulator
Last edited by JOE54; 05-14-2022 at 12:46 PM.
.................................................. ...the scariest thing in life is the unknown ...................................
Yeah, I had an oetiker clamp on but I just put the screw clamp on to try and salvage that hose until I can get through this tournament tomorrow. I trimmed about 1/4" off the Return Fuel Line hose and put that screw clamp on... say a prayer for me...
I've wiped the regulator off and the fuel reappears by the shaft, so i suspect the regulator is definitely bad.
Wishin' I was fishin'...
1990 Ranger 374v
1996 175 HP Mariner - Magnum EFI
25p Tempest - A45 model
80 lb 24v MinnKota Maxxum
Humminbird Helix 10
Humminbird Helix 7
Garmin EchoMap 106sv w/ LS
Dual 8' Power Poles
Wishin' I was fishin'...
1990 Ranger 374v
1996 175 HP Mariner - Magnum EFI
25p Tempest - A45 model
80 lb 24v MinnKota Maxxum
Humminbird Helix 10
Humminbird Helix 7
Garmin EchoMap 106sv w/ LS
Dual 8' Power Poles
just min
.................................................. ...the scariest thing in life is the unknown ...................................