Lost power

[krudville]

1994 4winns 5.0 omc efi. Cruising along and lost power. surged a couple times , coughed and died. Won’t start. Replaced fuel filter. No evidence of water. Fuel pump?

 

[Lou C]

Could be that, could also be the anti siphon valve on the gas tank, pick up tube or tank vent. You could try to run it (careful with hooking it up) on a portable tank to rule that out.

 

[krudville]

How do you test the anti-siphon valve on the gas tank?

 

[bruceb58]

1994 4winns 5.0 omc efi. Cruising along and lost power. surged a couple times , coughed and died. Won’t start. Replaced fuel filter. No evidence of water. Fuel pump?

Turn on the fuel pumps manually using jumpers(pin 87 to 30) and measure your fuel pressure.

You may only have one fuel pump on yours.

Can you post your model number?

 

[krudville]

I disconnected The fuel line and there was no gas in it prior to the fuel pump.

 

[krudville]

MODEL NUMBER. 50FACPMDA

 

[bruceb58]

I disconnected The fuel line and there was no gas in it prior to the fuel pump

Did the filter have fuel in it? Was it full of fuel?

 

[krudville]

Too late to test pressure in the boat. My mechanic, my volunteer son, pulled It. Any way to bench test?

 

[krudville]

Filter was full

 

[bruceb58]

This is the page that shows the parts of your fuel system. There is another pump besides the one above the filter.

All Products | iBoats

Since 1998, iboats is the most trusted water lifestyle online store for boat parts and accessories, boats for sale, and forums. Enjoy great priced products with fast shipping.

www.volvopentastore.com

Just so you know, you have a Ford engine, the fuel pumps are available but other parts are hard to come by. Hopefully, its just a fuel pump. If its the ECU, you have a huge problem.

 

[bruceb58]

Too late to test pressure in the boat. My mechanic, my volunteer son, pulled It. Any way to bench test?

It needs to be pumping fuel to test. The bigger problem is testing the high pressure pump. I have zero idea how to test this Ford high pressure pump.

I do not have a manual for this engine. That's the first thing you need to get before you proceed any further

 

[bruceb58]

Here is a manual set for your model number MD. Fortunately, this set has the Ford EFI diagnostics book. Those are hard to come by.

BTW...this is a bargain!!!

https://www.ebay.com/itm/164773216020?hash=item265d3fbf14:g:eek:D0AAOSwx~hgV4uB

 

[krudville]

Thanks. We‘ll take a look. I’ve been looking like crazy for a service manual.

 

[bruceb58]

Thanks. We‘ll take a look. I’ve been looking like crazy for a service manual.

Buy it right now.

For future reference you have an MD model. The Volvo MD and the OMC MD are identical since this is one of the joint venture years.

Another BTW...a lot of people that have these EFI Fords pull the EFI and put carbs on them when they can't fix the EFI....just a warning for you. Same applies for the distributor since I believe they use the same ECU

 

[krudville]

Bought the manual. Thanks for the heads up.

 

[krudville]

Your opinion on synthetic oil for marine use?

 

[Lou C]

Syn oil is not really needed, I use the standard Merc 25/40 marine oil. Many use the 15w/40 certified for diesel and gas engines.
If you wind up having to change to a carb, you will have to source (used) a cast iron intake for a Ford 302 (5 liter), and Holley does still sell brand new carbs that are calibrated for that size engine. It will run into some money but you will be free of the NLA syndrome of old marine EFI systems, because Holley parts are everywhere in the aftermarket.

Holley 0-80364 450 CFM Marine Carburetor

All Holley Marine Carburetors are designed to meet Coast Guard specifications. A marine carburetors fuel metering system is calibrated to compensate for unique engine loads found on boats. The J-style vent tubes direct fuel/fumes back into the carburetor for safe operation while on rough...

www.holley.com

This is calibrated for the Ford 5.0

the distributor is more challenging, here is what shows up in the OMC catalog for your engine/year, it does not look like the Prestolite BID system used on the GM V6s and V8s.

DISTRIBUTOR - 1994 Stern Drive 5 50FACPMDA | Crowley Marine

View parts diagrams and shop online for DISTRIBUTOR parts, 1994 Stern Drive 5 50FACPMDA. Offering discount prices on OEM parts for over 50 years. FAST $4.95 shipping available.

www.crowleymarine.com

there is this, I have no idea on how good they are....

Ford 221-302 Billet Distributor - Pertronix D230800 - Hardin Marine

Ford 221-302 Billet Distributor - Pertronix D230800

www.hardin-marine.com

 

[krudville]

Where is the anti siphon valve located? I was told this is a common problem with my boat. By the gas tank?
thanks

 

[PITBoat]

It's the thing the fuel line attaches to that's coming 90deg off of the pickup tube, right outta the tank.