Low pressure fuel pump for EFI

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   Suppose you swap in a '95 TBI PCM engine into a 93 ski that had a carburated engine.  Now the only thing that does not swap with the engine is the fuel tank and related plumbing.  I have read that the TBI engines have both a high and seperate low pressure fuel pump.  My question is where is the low pressure pump.  I know one of the pumps (I believe the high pressure pump) is located at the rear port side of the engine near the engine mount.  Is the low pressure pump inside the fuel tank?  If so, I suppose the tanks woud need to be swapped between boats if they are similiar in shape and size.

Any thoughts welcomed.

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David F Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: June-11-2004 Location: United States Status: Offline Points: 1770	Post Options Post Reply Quote David F Report Post Thanks(0) Quote Reply Topic: Low pressure fuel pump for EFI Posted: September-09-2004 at 6:29pm
	Suppose you swap in a '95 TBI PCM engine into a 93 ski that had a carburated engine. Now the only thing that does not swap with the engine is the fuel tank and related plumbing. I have read that the TBI engines have both a high and seperate low pressure fuel pump. My question is where is the low pressure pump. I know one of the pumps (I believe the high pressure pump) is located at the rear port side of the engine near the engine mount. Is the low pressure pump inside the fuel tank? If so, I suppose the tanks woud need to be swapped between boats if they are similiar in shape and size. Any thoughts welcomed.

Rick Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: March-03-2004 Location: United States Status: Offline Points: 338	Post Options Post Reply Quote Rick Report Post Thanks(0) Quote Reply Posted: September-09-2004 at 7:35pm
	I have a 2000 SN and both the Low and high pressure pumps are located on the engine. There is nothing in the tank I would call Eric at Midohionautiques and ask him
	2000 Ski

79nautique Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: January-27-2004 Location: United States Status: Offline Points: 7872	Post Options Post Reply Quote 79nautique Report Post Thanks(0) Quote Reply Posted: September-09-2004 at 7:38pm
	Is the low pressure pump used on the return side of the fuel lines? Why would you need a low and high pressure pump?

Rick Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: March-03-2004 Location: United States Status: Offline Points: 338	Post Options Post Reply Quote Rick Report Post Thanks(0) Quote Reply Posted: September-10-2004 at 3:01am
	The low pressure pump is used to bring the fuel to the PCM Fuel Control Cell The FCC has the high pressure pump and filter built in. The fuel is brought into the FCC about 9PSI and the EFI needs 30 for the injectors
	2000 Ski

nms1991 Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: May-31-2004 Location: United States Status: Offline Points: 46	Post Options Post Reply Quote nms1991 Report Post Thanks(0) Quote Reply Posted: September-12-2004 at 2:37pm
	On a 95 there is no fuel control cell. The low pressure pump is mounted on the port side in front of the rear mount. The high pressure pump is then mounted on the back of the cylinder head then it goes to the Tbi unit. PCM uses the low pressure pump to provide volume to the high pressure pump so it can kick up the pressure, but it does not suck the fuel very well. Check to see if you have a filter in line between the fuel tank and low pressure pump.

Low pressure fuel pump for EFI

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