What is the deal with Mastiff gas tanks?

Energy One
npb4me

npb4me

Member
On my way home tonight, my bike started to cut out. I reached down, hit reserve, and sped off. I hit the first gas staion I came to and only put 2.2 gallons in the tank. Doesn't my tank hold about 3.8 gallons? Is this normal?
 
Fibersnake

Fibersnake

Banjo Playing PsychoBilly
No it is not normal. I have a 05 Mastiff and get about 3.4 or so before I start the fill up. Do not want to hit reserve for it is an unknown quantaty.

Have you check and cleaned the fuel strainer lately? It may have some debris in it that is allowing it to get a certain point and then the lower crap is blocking from being able to make draw.

If not, would recommend that you drain waht you can and then pull the valve, clean the strainer and get in the habit of doing the same everso often. I usuall get it ever other oil change, myself.

Good luck and let us know how you make out.
 
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V

V

Guru
Fiber is right I have seen some of the other factory customs have this problem at the valve. Some manufacturers do not line their tanks and the filter will be packed in 500/1000 miles:iagree:


V
 
Fibersnake

Fibersnake

Banjo Playing PsychoBilly
You may also want to check the fuel cap and specifically the right one. Originally some had a Emission valve in them (it would ber white and screwed into the underside in the middle). If it is there, would recommend that you remove it for they have been known to create problems some times too. Basically if you fill up, if you have a tight cap, when it draws down, this POS valve may not act right and create a vacuum lock restricting the flow.

No need for it for 99% of us.
 
npb4me

npb4me

Member
Fibersnake said:
You may also want to check the fuel cap and specifically the right one. Originally some had a Emission valve in them (it would ber white and screwed into the underside in the middle). If it is there, would recommend that you remove it for they have been known to create problems some times too. Basically if you fill up, if you have a tight cap, when it draws down, this POS valve may not act right and create a vacuum lock restricting the flow.

No need for it for 99% of us.
Click to expand...
I will check this too.
 
H

haze324

Active Member
Fibersnake said:
You may also want to check the fuel cap and specifically the right one. Originally some had a Emission valve in them (it would ber white and screwed into the underside in the middle). If it is there, would recommend that you remove it for they have been known to create problems some times too. Basically if you fill up, if you have a tight cap, when it draws down, this POS valve may not act right and create a vacuum lock restricting the flow.

No need for it for 99% of us.
Click to expand...
^^

This got me 3 times before i finally decided to remove it. My bike shut down the day I got it riding home about 200 miles. What a shitty feeling having JUST bought a bike and it shutting off on the highway! AM I OUTTA GAS??? Nope just the damn gas cap.
 
lee

lee

Well-Known Member
yeah I was gonna suggest the gas cap - could you hear the pressure release when you took it off to fill up?
 
npb4me

npb4me

Member
lee said:
yeah I was gonna suggest the gas cap - could you hear the pressure release when you took it off to fill up?
Click to expand...
No, I didn't hear the pressure release. But I just removed the white plastic part from the gas cap, and I am going to drain the tank, and clean the screen.
 
W

woodysan

Member
gas cap!

:flag: Bought my bike from son 2001 Prosport I DO NOT keep my gas caps really tight. W.:cheers: :2thumbs: :2thumbs:
 
npb4me

npb4me

Member
I drained my tank, and cleaned my screen. I noticed that there is about a 2" difference on the petcock from on to reserve. So when my bike starts to die, I switch to reserve. At this point I have usually only burned 2 gallons of gas. This seems like I have to switch to reserve to soon. I should be able to burn a little over 3 gallons before needing reserve, right?
 
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