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I can't figure out why I'm not getting fuel from my gas tank…

Customer Question
Hello! I can't figure...

Hello! I can't figure out why I'm not getting fuel from my gas tank to my motor.

Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so the Marine Mechanic can help you best.

It's not getting fuel delivery from the gas tank to the motor. I replaced the lines, and tried re priming the bulb and still nothing. I checked the float and the sending unit. Both are still good.

Mechanic's Assistant: Is there anything else the Marine Mechanic should be aware of?

Not that I'm aware of. It wants to start, just not getting fuel.

Submitted: 2 months ago.Category: Boat
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Answered in 9 minutes by:
5/25/2018
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago
Charles
Charles, Marine Mechanic
Category: Boat
Satisfied Customers: 4,896
Experience: US Navy (Ret) Certified Mercury Marine Tech with over a decade of repair experience.
Verified

Hello, my name is***** will assist you.

Do you have the serial number, and model number of your engine?

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Customer reply replied 2 months ago
Serial number is ***** and I see 1150D83HY as model number
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

150 Opitmax is what it comes up as. Is that correct?

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Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

How long has it been sitting?

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Customer reply replied 2 months ago
That is correct
Customer reply replied 2 months ago
A season
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Thanks,

Which float did you check on it?

Have you removed the spin on filter to see if there is fuel in it?

Have you already checked the fuses on the engine?

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Customer reply replied 2 months ago
The one for the tank on boat. Where is the spin on filter located? Yes, I did. I can hear the pumps engaging and the motor turn over. But the new bulb doesn't want to prime for me.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

The filter is on the left side of the engine. It looks like a car oil filter.

Lets try this test. Remove the engine hood, then locate the fuel pump plug at the front of the engine, it has 2 wires in it and they should be red and black. Unplug this connector. then turn the key to the On position and listen to see if you can hear the other pump on the engine.

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Customer reply replied 2 months ago
I did that. It sounds like a pump by the fuel rail/injectors is still trying to engage. But other then that, nothing else.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

So it runs for a few seconds?

Plug in the front pump and then unplug the rear pump and try the test again. See if the front one will run now.

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Customer reply replied 2 months ago
It doesnt want to physically run. It's like the cylinoid is just engaging with the front unpluged.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Ok, first make sure that the kill switch in fully in the on position. Then locate the 3 relays on the right side of the engine. On 2 of them there is a blue and a green wire going to them. The other has mainly red wires going to it. Swap one of the other relays with the one that has all the red wires going to it. Then see if it will run the pumps correctly. Part 5 is the relay.

https://www.boats.net/catalog/mercury/outboard-by-hp/150hp/1b417702-up-usa-cat-90-803502007/electrical-plate-assembly-serial-number-1b490866-and-up

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Customer reply replied 2 months ago
That didn't work. So, I hooked them back up to where they need to go, and I turned it on. I hear the pumps turn on but still no fuel. It's not getting to the main pump on motor.
Customer reply replied 2 months ago
I don't even smell fuel from the motor after trying to start it.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Look for the brass plug at the front of the VST. It is part 25. Open it and see if any fuel comes from it.

https://www.boats.net/catalog/mercury/outboard-by-hp/150hp/1b417702-up-usa-cat-90-803502007/vapor-separator-components

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Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Locate part 25 on the VST. It is a brass plug. Open it and see if there is any fuel that comes from it.

https://www.boats.net/catalog/mercury/outboard-by-hp/150hp/1b417702-up-usa-cat-90-803502007/vapor-separator-components

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Customer reply replied 2 months ago
I did and nothing.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Ok, have the fuel hoses been off any parts of the engine recently?

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Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

do you have fuel pumping thru the bulb when you squeeze it?

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Customer reply replied 2 months ago
I feel it trying to prime but nothing
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Ok, check in the rigging tube to see that there is no fuel in it.

If there is not, the needle, part 15 is going to be stuck in the VST. This will need for you to open the VST and clean it out and replace the needle.

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Customer reply replied 2 months ago
Is, that pretty much like a jet for a carberator?
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

IT is like the needle and float in a carb bowl.

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Customer reply replied 2 months ago
The rigging tube connects to it from the bulb correct?
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

That is the tube that all the cables and hoses run thru. There is also a connection for the fuel hose inside it. Point the arrow on the bulb up and see if the bulb will now pump fuel when you squeeze it. Look to see if any comes out around the end of the tube inside the engine.

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Customer reply replied 2 months ago
I'm not getting any fuel, but I do hear a little bit of air that way.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Ok, this could be in the tank. Have you tried on a separate fuel source to see if it is the same?

Can you access the tank where the fuel hose attaches to it?

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Customer reply replied 2 months ago
No, I wanted to. I don't have any other source too
Customer reply replied 2 months ago
Would I be looking for the main line connection into the top of tank
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Yes thde main connection on the top of the tank. Take the hose from it and make sure that the hose is not collapsed. If it is good, remove the fitting from the top of the tank. Then inspect the tube that runs down the center of it to make sure that it is not loose on the fitting. Grasp the rube while holding the fitting to see if the tube will turn or not. You do not want it to turn.

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Customer reply replied 2 months ago
The same fitting that is connected to the fuel line?
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Yes that is the one.

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Customer reply replied 2 months ago
This one isn't going to be so easy to remove.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

It can be really a pain in the rear to get to. If the hose on it is off, that will allow the fuel system to suck air and not fuel. Thus causing the engine to run out of fuel.

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Customer reply replied 2 months ago
That is completely understandable.
Customer reply replied 2 months ago
The key is getting it off without breaking anything.
Customer reply replied 2 months ago
Plus I'm running out of day light
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

True. There is a large but on the tank side that you may need to hold to loosen the fitting. A 3/4" wrench normally fits the fitting.

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Customer reply replied 2 months ago
I see that. It sits on top of my tank right under fitting. I also don't have big enough wrench on hand either to do that.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Large crescent wrenches work as well.

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Customer reply replied 2 months ago
I know but I don't have one on hand either...
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

You can rent most of these from many chain auto parts stores.

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Customer reply replied 2 months ago
I'd have went and bought some but they all closed by the time got to that point to realizing I need one.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

There is always tomorrow to get it done.

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Customer reply replied 2 months ago
If by chance, that isn't the problem what else do you think can cause it?
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

there is also a anti-siphon valve at the end of the fuel line. It can stick.

The fuel line can be collapsed on either end. That also needs a look.

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Customer reply replied 2 months ago
Which end of fuel line would I find the valve?
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

It is on the tank end. It looks like a hose barb except there is a ball and a spring inside it.

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Customer reply replied 2 months ago
Ohh okay. So, the part I'm currently trying to remove without breaking anything.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Could also be brass

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Customer reply replied 2 months ago
Yeah, that's the one. It looks like there's corrosion and thread lock on the threads and into the connection. Plus, I still can't fully get the fuel line off it without damaging both.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Cut a slit into the fuel line to get it free from the valve. Then you can use a wrench to remove the valve to make taking the pick up easier to get out.

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Customer reply replied 2 months ago
I got the fuel line off the valve. For kicks, lightly covered the end with my thumb and squeezed the bulb and felt pressure pulling threw. So it's gotta be in the valve or the pickup tube. Correct?
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

That is what it is sounding like yes.

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Customer reply replied 2 months ago
Alrighty. Sounds like getting we are getting somewhere.
Customer reply replied 2 months ago
If I put a little bit of cooking oil on the threads. Would it make it little easier to remove?
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Possibly. Penetrating oil may work as well.

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Customer reply replied 2 months ago
Won't the chemicals in the spray potentially be bad for the plastic tank?
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

They should not be. It does hold gas which is pretty caustic.

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Customer reply replied 2 months ago
I don't have penetrating oil right now. I only have break clean and I'm not too sure about that one.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

That may help dissolve the pipe dope on the fitting.

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Customer reply replied 2 months ago
in other words, give it a try and see? Also it shouldn't harm anything?
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

It shouldn't hurt anything.

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Customer reply replied 2 months ago
Trying it now
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Ok, keep me informed.

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Customer reply replied 2 months ago
It's still not wanting to break loose. Or even budge.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

It has been in there for several years. It is going to be tough to move.

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Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Cheater pipe on a big crescent wrench works wonders.

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Customer reply replied 2 months ago
I can tell it's been on there a while. Yeah, I know. I've been trying different tricks that id normally do like on vehicles but not to extreme. If It breaks on me and in the wrong place, it usually makes the job harder.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

That is true, done want to break it down inside that fitting on the tank.

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Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

I have found that If I go to tighten it a bit just to get it moving, then I can get it loose enough to unscrew.

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Customer reply replied 2 months ago
I keep on trying that too. In hopes that the threads will break free. But its just not going. Even gripping the fitting using opposing force when trying to turn the valve, is just making it want to bend not turn.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Can you get the anti-siphon valve off so you can get a better grip on the large fitting?

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Customer reply replied 2 months ago
Nope.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Have any acetone? That may work on the pipe dope

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Customer reply replied 2 months ago
Nope. I have 91% rubbing alcohol.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Have any acetone? That may work on the pipe dope

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Customer reply replied 2 months ago
No, I do not have any.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Nail polish remover typically has some in it if there is some of that around.

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Customer reply replied 2 months ago
I Do not have any of that either.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

May have to run to the auto parts store

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Customer reply replied 2 months ago
I didn't want to have to go anywhere till I got this stuff off. My only form of transportation right now is walking.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Ok, seems that elbow grease it is.

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Customer reply replied 2 months ago
I went and got penetration oil and better wrenches but it's still fighting me.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Has it moved at all yet?

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Customer reply replied 2 months ago
No, not really.
Customer reply replied 2 months ago
It's being a tough s.o.b
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Can you smack the end of the wrench with a hammer?

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Customer reply replied 2 months ago
I've been trying that. It's starting to want to round on me..
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Pipe wrench?

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Customer reply replied 2 months ago
Trying that too.
Customer reply replied 2 months ago
I'm pretty much throwing everything I can at it without putting more into then needed and breaking something. But I'm literally getting stumped...
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Ugh, it has to come out.

The hose that you it off it was about 3/8" and not 5/8" right?

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Customer reply replied 2 months ago
It looks like a 3/8 diam hose.
Customer reply replied 2 months ago
It runs from there, right to connection for bulb then to motor. I traced it back to make sure I was pulling the right one.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Ok, good. The vent hose is 5/8" diameter and also goes to the top of the tank. It is typically black in color.

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Customer reply replied 2 months ago
Well, there is only one connection with line that connects at top of tank and runs towards back of boat to motor.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

That is the correct one

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Customer reply replied 2 months ago
Just gotta get it off though...
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Yea, never seen one that tough.

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Customer reply replied 2 months ago
When it's been on there for a while it will happen.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Yes, that is true.

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Customer reply replied 2 months ago
I got the rigged nipple thing off and as soon as I did, I held the fuel line next to it and gently squeezed the build and got fuel.
Customer reply replied 2 months ago
From the pick-up tube
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Great. So it seems that the anti-siphon valve is sticking. That you can get at most any marine parts store. Some auto parts stores may even have them.

It is a safety item and should be installed on the tank.

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Customer reply replied 2 months ago
I wish it was that easy. I can only find them as orderable with shipping by tuesday..
Customer reply replied 2 months ago
it is and I like the reasoning behind them being there too. Makes me feel safer.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Tues is not too bad. But you lose the weekend though.

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Customer reply replied 2 months ago
A nightmare I cannot endure...
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

Loosing the weekend?

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Customer reply replied 2 months ago
I'm not really losing out on the weekend more or less then losing out on taking the boat out.
Marine Mechanic: Charles, Marine Mechanic replied 2 months ago

True. As a test you can pop the ball out of the valve. Take a screwdriver and drive out the ball from the hose side toward the threads. This will leave you with an open fitting and no protection from leaks in the system. But it will work to see if you are getting fuel to the engine and that it will start.

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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