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FUEL FLOW METERS & E.F.I. ENGINES

Old 07-26-2005, 05:54 PM
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Default FUEL FLOW METERS & E.F.I. ENGINES

Has anyone run into problems using a fuel flow meter on an engine equipped w/ E.F.I. ? My 4.3L Merc. occasionally bogs down or cuts out. It doesn't happen often enough to pinpoint but a clogged filter was suggested. When reading the manual(imagine that) to look for part numbers it states that the fuel pump and filter are specifically designed to function together and not to add an inline filter. The manufacturer of the fuel meter requires one before their unit. Anybody run into this before? Tom
Old 07-27-2005, 06:57 AM
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Default Re: FUEL FLOW METERS & E.F.I. ENGINES

Sounds like you may have an inboard so this may not be applicable to your situation, BUT, I have a Merc 200 EFI outboard and have the SH flow meter installed. The total gallons function is slightly off but it errs on the low side so I really dont worry about it. I primarily use mine to monitor the burn rate more than anything else. I havent experienced any fuel delivery problems at all.
Old 07-27-2005, 07:26 PM
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Default Re: FUEL FLOW METERS & E.F.I. ENGINES

My set up is fuel delivered to a Racor filter, then to the FloScan sensor, then to the MercCruiser fuel filter on the 5.7L EFI engine. I use 3/8" lines throughout.My fuel conumption at 3500 RPM, 22 kts, is 8 GPH. At WOT it is 14 GPH. I have never had a fuel delivery problem with this configuration.
Old 08-02-2005, 03:57 PM
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Default Re: FUEL FLOW METERS & E.F.I. ENGINES

I added a Navman flowsensor to a 5.7L Volvo this spring. No problems so far.

Calls for a filter before the sensor. No room on my setup and still have a vertical mount position and didn't want to add a duplicate filter so mine is before the original fuel filter.

Dana
Old 09-08-2005, 11:07 AM
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Default Re: FUEL FLOW METERS & E.F.I. ENGINES

I thought any in-line fuel filter should be AFTER the fuel sending unit. Water seperator is OK before the sending unit. FloScan has great Installation Manuals on their website.
Old 09-08-2005, 11:22 AM
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Default Re: FUEL FLOW METERS & E.F.I. ENGINES

Fuel tank to ---> Racor to ---> Navman 2100 transducer to ---> Yamaha 225 OX66
Works perfectly.
Old 09-11-2005, 07:19 PM
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Default Re: FUEL FLOW METERS & E.F.I. ENGINES

I have a 250 EFI Merc. An inline fuel filter before the fuel sensor and then up to the engine through the engine filter. Never had any problems. 3 years old.
Only drawback is, it tells me exactly how much fuel is being used. @$4.00 a gallon, now I really don't want to know!!!!!

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