RobM626 Posted December 18, 2018 Share Posted December 18, 2018 What’s up guys? I have 2 fuel tanks On my 08 granite with mp7. Driver has gotten lazy when fueling up and is only filling driver side tank 90% of the time and 2 times in the past 2 weeks the passenger side tank has run dry. The truck shut off both times and I had to fuel passenger side tank and re-prime fuel system to get it running again. I guess my question is does the fuel not equalize between both tanks? I told him to fill both tanks but he thinks he knows better than me and replies “but I never used to have to fill both. This never used to happen”. Is there a transfer pump between the tanks that could be bad? Quote Link to comment https://www.bigmacktrucks.com/topic/55082-dual-fuel-tanks-on-mack-granite-with-mp7/ Share on other sites More sharing options...
HeavyGunner Posted December 18, 2018 Share Posted December 18, 2018 Either way sounds like the driver just needs to listen to what he’s told. If the boss wants both tanks filled up do it. 2 Quote The problems we face today exist because the people who work for a living are outnumbered by the people who vote for a living.The government can only "give" someone what they first take from another. Link to comment https://www.bigmacktrucks.com/topic/55082-dual-fuel-tanks-on-mack-granite-with-mp7/#findComment-411562 Share on other sites More sharing options...
RobM626 Posted December 18, 2018 Author Share Posted December 18, 2018 Yea tell me about it... this isn’t the first thing that’s happened after specific instructions to do or not do something... and then he calls me like “this or that just happened, I don’t know why, something is wrong with the truck” i would be too scared or embarrassed to call my boss if something happened that he specifically told me to do or not to do. I would be walking my ass to a gas station and buying a fuel can and fuel with my own money just so he didn’t find out I was screwing up the day or the truck 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/55082-dual-fuel-tanks-on-mack-granite-with-mp7/#findComment-411563 Share on other sites More sharing options...
fjh Posted December 18, 2018 Share Posted December 18, 2018 Check your tank vents They should equalize on there own Quote Link to comment https://www.bigmacktrucks.com/topic/55082-dual-fuel-tanks-on-mack-granite-with-mp7/#findComment-411575 Share on other sites More sharing options...
RobM626 Posted December 18, 2018 Author Share Posted December 18, 2018 26 minutes ago, fjh said: Check your tank vents They should equalize on there own Will check when he gets back tonight. Quote Link to comment https://www.bigmacktrucks.com/topic/55082-dual-fuel-tanks-on-mack-granite-with-mp7/#findComment-411577 Share on other sites More sharing options...
keg1 Posted December 18, 2018 Share Posted December 18, 2018 Happened on my Ch when I had it. Loosened both caps up and in a little while fuel equaled out. Quote Link to comment https://www.bigmacktrucks.com/topic/55082-dual-fuel-tanks-on-mack-granite-with-mp7/#findComment-411578 Share on other sites More sharing options...
RobM626 Posted December 18, 2018 Author Share Posted December 18, 2018 4 minutes ago, keg1 said: Happened on my Ch when I had it. Loosened both caps up and in a little while fuel equaled out. We’re they the newer style caps ? 08+? Quote Link to comment https://www.bigmacktrucks.com/topic/55082-dual-fuel-tanks-on-mack-granite-with-mp7/#findComment-411580 Share on other sites More sharing options...
keg1 Posted December 18, 2018 Share Posted December 18, 2018 1 minute ago, RobM626 said: We’re they the newer style caps ? 08+? No it was a 2000 Quote Link to comment https://www.bigmacktrucks.com/topic/55082-dual-fuel-tanks-on-mack-granite-with-mp7/#findComment-411581 Share on other sites More sharing options...
RobM626 Posted December 18, 2018 Author Share Posted December 18, 2018 34 minutes ago, keg1 said: No it was a 2000 Yea my 2000 has a vent with a plate and 2 screws holding the plate down. The 08 doesn’t have that from what I saw other day. I think the caps are vented on the 08 Quote Link to comment https://www.bigmacktrucks.com/topic/55082-dual-fuel-tanks-on-mack-granite-with-mp7/#findComment-411582 Share on other sites More sharing options...
keg1 Posted December 19, 2018 Share Posted December 19, 2018 My caps were vented to. I put a new one on it and didn't have any more problems. I cleaned the old caps good and used them on one of my r models Quote Link to comment https://www.bigmacktrucks.com/topic/55082-dual-fuel-tanks-on-mack-granite-with-mp7/#findComment-411596 Share on other sites More sharing options...
RobM626 Posted December 19, 2018 Author Share Posted December 19, 2018 16 minutes ago, keg1 said: My caps were vented to. I put a new one on it and didn't have any more problems. I cleaned the old caps good and used them on one of my r models Cracked the caps open like you said and fuel equalized. Thanks, appreciate the advice... I personally never had a problem because I always put 80-85% in each tank. But I can’t stay on everyone’s ass with simple things such as fuel 1 Quote Link to comment https://www.bigmacktrucks.com/topic/55082-dual-fuel-tanks-on-mack-granite-with-mp7/#findComment-411597 Share on other sites More sharing options...
fjh Posted December 19, 2018 Share Posted December 19, 2018 15 hours ago, RobM626 said: Cracked the caps open like you said and fuel equalized. Thanks, appreciate the advice... I personally never had a problem because I always put 80-85% in each tank. But I can’t stay on everyone’s ass with simple things such as fuel So you need to clean or check the vents you not a good idea to run around with the caps loose! 😁 Quote Link to comment https://www.bigmacktrucks.com/topic/55082-dual-fuel-tanks-on-mack-granite-with-mp7/#findComment-411626 Share on other sites More sharing options...
keg1 Posted December 20, 2018 Share Posted December 20, 2018 9 hours ago, fjh said: So you need to clean or check the vents you not a good idea to run around with the caps loose! 😁 I loosened mine in the driveway just to see if that was the problem. Cleaned them but got a couple new ones. Quote Link to comment https://www.bigmacktrucks.com/topic/55082-dual-fuel-tanks-on-mack-granite-with-mp7/#findComment-411652 Share on other sites More sharing options...
RobM626 Posted December 21, 2018 Author Share Posted December 21, 2018 On 12/19/2018 at 10:59 AM, fjh said: So you need to clean or check the vents you not a good idea to run around with the caps loose! 😁 Yea I know I just loosen Ed them at the yard and tightened back up... I’m gonna grab new ones. Thank you Quote Link to comment https://www.bigmacktrucks.com/topic/55082-dual-fuel-tanks-on-mack-granite-with-mp7/#findComment-411734 Share on other sites More sharing options...
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