I have 2007 Mariner 5hp 2 stroke engine. Do you know what the internal fuel tank capacity is?

This is all I could find hope it helps. TGB R125X Specs
The TGB R125X model is a Scooter bike manufactured by TGB . In this version sold from year 2008 , the dry weight is 118.0 kg (260.1 pounds) and it is equiped with a Single cylinder, four-stroke motor. The engine produces a maximum peak output power of and a maximum torque of . With this drive-train, the TGB R125X is capable of reaching a maximum top speed of . Regarding the chassis characteristics, responsible for road holding, handling behaviour and ride confort, the TGB R125X have a frame with front suspension being and in the rear suspension it is equiped with . Stock tire sizes are 130/60-13 on the front, and 130/60-13 on the rear. As for stopping power, the TGB R125X braking system includes Single disc size at the front and Single disc size at the rear.
TGB R125X General Information Brand TGB Model TGB R125X Year Year Category Scooter Factory Warranty (Years / miles) TGB R125X Dimensions, Aerodynamics and weight Frame type Seat details Wheelbase Length 1,896 mm (74.6 inches) Width 670 mm (26.4 inches) Height 1,125 mm (44.3 inches) Seat Height Alternate Seat Height Ground Clearance Trail size Wheels details Front Tyres - Rims dimensions Rear Tyres - Rims dimensions Front brakes Single disc Rear brakes Single disc Front Brakes Dimensions - Disc Dimensions Rear Brakes Dimensions - Disc Dimensions Curb Weight (including fluids) Dry Weight 118.0 kg (260.1 pounds) Front Percentage of Weight Rear Percentage of Weight Weight-Power Output Ratio : Fuel Tank Capacity 6.80 litres (1.80 gallons) Reserve Fuel Capacity Carrying Details and Capacity Front Suspension Front Suspension Travel Rear Suspension Rear Suspension Travel
TGB R125X Engine and Transmission Technical Data Engine type - Number of cylinders Single cylinder, four-stroke Engine details Fuel system Engine size - Displacement - Engine capacity 124.00 ccm (7.57 cubic inches) Bore x Stroke 52.4 x 57.2 mm (2.1 x 2.3 inches) Compression Ratio Number of valves per cylinder Camshaft Valvetrain Configuration Maximum power - Output - Horsepower Maximum torque Engine Maximum RPM Cooling system Air Lubrication system Engine oil capacity Exhaust system Gearbox Automatic Transmission type, final drive ratio Belt Clutch type Driveline TGB R125X Performance Top Speed Acceleration 0 to 100 km/h (0 to 62 mph) Acceleration 0 to 400m (1/4 mile) Recuperation 60 to 140 km/h in highest gear Fuel Consumption - MPG - Economy - Efficiency CO2 emissions Emissions TGB R125X Electrical Systems, Ignition and Equipment Ignition Type C.D.I. Electrical Details Starter Type Instruments Lights

Check the electrical connector at the tank first, it may be loose. While you have the tank down, you can pull the sender, check for any obstructions, plug it in, and manually move the float with the key on to check the gauge circuit.

2 cycle, 50:1

have you checked the fuel pump diaphrams are ok and are the connections on the fuel tank and line ok ? primer bulb not sticking ? carbs clean ? fuel pump connection to crankcase ok ?

Starving for gas! check fuel tank vent. Check fuel lines. Check Fuel filter. Check fule pump. Check carbs. clean with seafoam!

Hey Steven,
get one of these manuals, you will be glad you did,, it will serve you well for as long as you own your Mariner! The guys at MarineEngine will be glad to help you too!!

Mariner Outboard Service Repair Manuals by Seloc 1977 2004

Outboard Motors Boat Parts Marine Engines Inboard Boat Motor

Model MS 181 Engine single-cylinder two-stroke Capacity 31.8cc, 1.94cu.in Bore 38mm, 1.6in Stroke 28mm, 1.1in Ignition Electronic (Breakerless) magneto Spark Plug NGK CMR6H Electrode Gap 0.5mm, 0.02in Carburetor All position diaphragm type with built-in fuel pump Fuel Tank 0.27litre Fuel mixture 50:1 with Stihl two-stroke air-cooled engine oil Catalytic Converter No Chain lubrication Automatic oil pump Oil tank 0.265 litre Weight
(dry, no bar, no chain) 4.3kg (9.5lb)

2001 Yamaha YZ80 Specifications Engine Engine Type
2-stroke Displacement
83 cc Bore x Stroke
47 mm x 47 mm Compression Ratio
8.2:1 Engine Cooling
Liquid Carburetion Carburetor
26mm Mikuni Transmission Transmission
6 - speed Chassis Wheelbase
49.5 in Ground Clearance
13.7 in Seat Height
33.6 in Fuel Tank Capacity
1.3 gallons Forks Forks
33mm Kayaba Fork Travel
10.8 in Shock Shock(s)
Kayaba Shock Travel
11.1 in Wheels and Tires Front Wheel
17 in Rear Wheel
14 in Brakes
disk/disk Other Information Intended Use
Motocross Color Scheme
Blue Cost when new
$3199

Congratulations. You have just purchased a very high performance 2 stroke 125cc from a very talented Italian manufacturer. A two stroke engine needs 2T oil to be mixed with the fuel before it is fed into the engine. This is a cumbersome job and one has to get the ratio just right. So in order to make the job easier you have two tanks. 1) The regular fuel tank & 2) A small capacity 2T oil tank (made of plastic mostly) which is hidden behind a side panel. In order to give a regular dose of 2T oil there is a tiny oil pump attached to the side of the engine. This oil pump has to be actuated simultaneously when the carb slide is actuated. Hence the banjo. So now you know why the throttle cable splits into 2. One goes to the carburator and other to the oil pump. Good luck and enjoy your bike sensibly.,,,