Two fuel pumps in series??

[SternDriveEd]

1993 Chaparral, 2050 Cuddy. 4.3 LX . Engine Serial OD 843641. So I replaced the Fuel Pump 2 seasons ago. Mercruiser $400 part. Original one failed. I just experienced a fuel issue and needed an emergency fuel delivery. $$. Seems okay now with only a short run back to our home dock. Either the tank was lower than I thought, or the fuel pump may be failing. I plan to Tee-In a pressure gauge at the carburetor inlet and monitor the pressure. Also I was thinking about having a Universal 12 volt Fuel Pump ready to easily install into the 3/8 hose leading from the tank to the filter and pump. My question is will a second temporary fuel pump be able to “ push through “ the Mercruiser fuel pump if the issue happens again? Really don’t like be stranded on the water. They are available 5-9 psi, or 4-7 psi. Amazon of course.

 

[Scott Danforth]

I would question if amazon pumps are marine rated.

additionally, no, generally you can not push fuel thru a failed pump

 

[dubs283]

I plan to Tee-In a pressure gauge at the carburetor inlet and monitor the pressure.

Good plan, you should also check fuel pump vacuum. There may be an issue in the fuel system before the pump

I've found when people add a "pusher" fuel pump in between the tank and oem filter/pump assembly it's merely masking an easily fixable issue, ymmv

 

[Bt Doctur]

Or you could have a screen INSIDE the pickup tube.
You can get a fitting for the carb to accept a barbed fitting,So get the elec pump .put some alligator clips on it some barbed fittings and some hose

 

[SternDriveEd]

So after hearing from a few folks I could do this. Have the “Test Fuel Pump” ready to install. It would consist of 3/8 fuel hose, an in-line filter and of course the pump, along with the correct fittings on each end. If the issue repeats itself, I can by-pass the current filter and Mercruiser fuel pump with the “Test Fuel Pump”. There’s either a 4-7 psi OR a 5-9 psi available. I’ve got the 4 BBL Weber carb. Thoughts?

 

[Bondo]

Ayuh,...... 4 to 7 psi,......

But,..... yer buildin' a Bomb, rather than just diagnosin' the problem, 'n fixin' it,.....