Mark Twain Boats

Mark Twain Boat Forums => General Mark Twain Discussion => Topic started by: Superbee on May 21, 2017, 06:17:28 PM

Title: Gas Tank
Post by: Superbee on May 21, 2017, 06:17:28 PM
Well Pulled the Gas tank out today 39x16x12 Tank what's that 32 Gallons? pulled it because i could never to get he Gas Gauge to Work pulled the Sending unit it's all rusted together anyone ever found an after market?
Title: Re: Gas Tank
Post by: Haulnazz15 on May 25, 2017, 10:33:42 AM
I would imagine the fuel senders are pretty much universal as long as you get one with the same armature length.  I'd think that that would be the main factor, with resistance values being the other in order to make sure the fuel gauge functions properly.
Title: Re: Gas Tank
Post by: Superbee on May 29, 2017, 09:13:56 PM
Let Google do the work I ordered a Moeller Swingarm Electric Sending Unit says it won't rust or corrode $25, Next step will be cleaning the gas tank lots of rust in there i googled that anyone know of a cheap way of cleaning this? Looks like Battery acid or White Vinegar The vinegar way would cost about $60 to me that too much, a Friend says use Ph Down? 
Any ideas?
Title: Re: Gas Tank
Post by: Superbee on May 30, 2017, 03:52:46 PM
Next Question has anyone replaced the Tank with a Plastic Tank out of a Van ,Truck or Car there has to be one out there that is close to that size

Y,M,M?
Title: Re: Gas Tank
Post by: Haulnazz15 on June 07, 2017, 12:58:41 PM
Why would you replace it with a plastic tank?  What's wrong with the original one? I don't see why it would be prohibited as long as it was properly secured/grounded.
Title: Re: Gas Tank
Post by: Superbee on June 10, 2017, 10:33:47 PM
The Gas tank may have a leak I don't know yet Looks like i might have leaking, Most the paint on the out side is gone in Spots, I was just curious if anyone has before Plastic don't rust Plus I also might need it for the fuel pump 50psi EFI, I have decided to go with Muriatic Acid Will cost less $20 to clean it good will check for leaks and go from there
Title: Re: Gas Tank
Post by: Haulnazz15 on June 14, 2017, 08:49:40 AM
Well the 50PSI needed for EFI isn't in the fuel tank, it's in the line from the pump to the injectors/throttle body.  The only thing that's sometimes a bit different is the need for a return line to the tank, depending on the system used. Plastic cracks just like anything else, so I'm not sure I'd choose it over metal for just that purpose.  Either way, it ought to work.  Did you swap out for an EFI engine?  I don't know of any EFI-equipped 'Twains from the factory.
Title: Re: Gas Tank
Post by: Superbee on June 17, 2017, 06:02:50 PM
I have not Made up my Mine what I'm going to do yet it could come down to money the engine block now is cracked I got 2 engines a 1972 350 and a 1998 Vortex with EFI I got the controller and wiring and a friend has reprogrammed the controller disabling all sensors and has setup the tuneup
Title: Re: Gas Tank
Post by: iowatwain2 on August 01, 2017, 11:29:05 AM
Well Pulled the Gas tank out today 39x16x12 Tank what's that 32 Gallons? pulled it because i could never to get he Gas Gauge to Work pulled the Sending unit it's all rusted together anyone ever found an after market?

Most boat suppliers should have them. I have purchased several for my boat over the years. best bet is to bring the old one in with you to match up the bolt patterns to make sure it will fit.