<?xml version="1.0" encoding="us-ascii"?><InstanceReport xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><Version>2.4.0.8</Version><ReportLongName>000080 - Disclosure - 3. Amounts Due To Related Parties and Loans Payable To Stockholders</ReportLongName><DisplayLabelColumn>true</DisplayLabelColumn><ShowElementNames>false</ShowElementNames><RoundingOption /><HasEmbeddedReports>false</HasEmbeddedReports><Columns><Column FlagID="0"><Id>1</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><CurrencyCode /><FootnoteIndexer /><hasSegments>false</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol /><contextRef><ContextID>D130101_130630</ContextID><EntitySchema>http://www.sec.gov/CIK</EntitySchema><EntityValue>0001113313</EntityValue><PeriodDisplayName /><PeriodType>duration</PeriodType><PeriodStartDate>2013-01-01T00:00:00</PeriodStartDate><PeriodEndDate>2013-06-30T00:00:00</PeriodEndDate><Segments /><Scenarios /></contextRef><UPS /><CurrencyCode /><OriginalCurrencyCode /></MCU><CurrencySymbol /><Labels><Label Key="CalendarSupplement" Id="0" Label="6 Months Ended" /><Label Key="Calendar" Id="1" Label="Jun. 30, 2013" /></Labels></Column></Columns><Rows><Row FlagID="0"><Id>1</Id><IsAbstractGroupTitle>true</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>1</Level><ElementName>us-gaap_DisclosureTextBlockAbstract</ElementName><ElementPrefix>us-gaap_</ElementPrefix><IsBaseElement>true</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText /><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>xbrli:stringItemType</ElementDataType><SimpleDataType>string</SimpleDataType><IsTotalLabel>false</IsTotalLabel><UnitID>0</UnitID><Label>Notes</Label></Row><Row FlagID="0"><Id>2</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><LabelSeparator>

</LabelSeparator><Level>2</Level><ElementName>fil_AmountsDueToRelatedPartiesAndLoansPayableToStockholders</ElementName><ElementPrefix>fil_</ElementPrefix><IsBaseElement>false</IsBaseElement><BalanceType>na</BalanceType><PeriodType>duration</PeriodType><IsReportTitle>false</IsReportTitle><IsSegmentTitle>false</IsSegmentTitle><IsCalendarTitle>false</IsCalendarTitle><IsEquityPrevioslyReportedAsRow>false</IsEquityPrevioslyReportedAsRow><IsEquityAdjustmentRow>false</IsEquityAdjustmentRow><IsBeginningBalance>false</IsBeginningBalance><IsEndingBalance>false</IsEndingBalance><IsReverseSign>false</IsReverseSign><FootnoteIndexer /><Cells><Cell FlagID="0" ContextID="D130101_130630" UnitID=""><Id>1</Id><IsNumeric>false</IsNumeric><IsRatio>false</IsRatio><DisplayZeroAsNone>false</DisplayZeroAsNone><NumericAmount>0</NumericAmount><RoundedNumericAmount>0</RoundedNumericAmount><NonNumbericText>&lt;!--egx--&gt;&lt;p style='margin-top:0in;margin-right:0in;margin-bottom:10.0pt;margin-left:0in;line-height:115%;margin-bottom:0in;margin-bottom:.0001pt;line-height:normal'&gt;&amp;nbsp;&lt;/p&gt; &lt;p style='margin-top:0in;margin-right:0in;margin-bottom:10.0pt;margin-left:0in;line-height:115%;margin-bottom:0in;margin-bottom:.0001pt;line-height:normal'&gt;&lt;b&gt;3. &amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160;&amp;#160; Amounts Due to Related Parties and Loans Payable to Stockholders&lt;/b&gt;&lt;/p&gt; &lt;p style='margin-top:0in;margin-right:0in;margin-bottom:10.0pt;margin-left:0in;line-height:115%;margin-bottom:0in;margin-bottom:.0001pt;line-height:normal'&gt;&amp;nbsp;&lt;/p&gt; &lt;p style='margin-top:0in;margin-right:0in;margin-bottom:10.0pt;margin-left:0in;line-height:115%;margin-bottom:0in;margin-bottom:.0001pt;line-height:normal'&gt;From February 2007 until June 30, 2013 the Company received a number of loans from stockholders, related parties and unrelated third parties.&amp;#160; &lt;/p&gt; &lt;p style='margin-top:0in;margin-right:0in;margin-bottom:10.0pt;margin-left:0in;line-height:115%;margin-bottom:0in;margin-bottom:.0001pt;line-height:normal'&gt;As of June 30, 2013 the Company had received loans of &amp;#160;$627,850 (Euro 225,000; CAD 72,300; $266,382) &amp;#160;&lt;/p&gt; &lt;p style='margin-top:0in;margin-right:0in;margin-bottom:10.0pt;margin-left:0in;line-height:115%;margin-bottom:0in;margin-bottom:.0001pt;line-height:normal'&gt;December 31, 2012 &amp;#150;$631,631 (: Euro 225,000; CAD 72,300; $262,300) from stockholders, &lt;/p&gt; &lt;p style='margin-top:0in;margin-right:0in;margin-bottom:10.0pt;margin-left:0in;line-height:115%;margin-bottom:0in;margin-bottom:.0001pt;line-height:normal'&gt;loans of $35,242 (CAD 27,600; $9,000) &amp;#160;&lt;/p&gt; &lt;p style='margin-top:0in;margin-right:0in;margin-bottom:10.0pt;margin-left:0in;line-height:115%;margin-bottom:0in;margin-bottom:.0001pt;line-height:normal'&gt;(December 31, 2012 &amp;#150;$145,051: CAD 10,000; $135,000) from a related party and &amp;#160;loans of $144,171 (CAD 10,000; $ 135,000)&lt;/p&gt; &lt;p style='margin-top:0in;margin-right:0in;margin-bottom:10.0pt;margin-left:0in;line-height:115%;margin-bottom:0in;margin-bottom:.0001pt;line-height:normal'&gt;&amp;#160;(December 31, 2012 &amp;#150;$ 145,051: CAD 10,000; $135,000) from unrelated third parties&lt;/p&gt; &lt;p style='margin-top:0in;margin-right:0in;margin-bottom:10.0pt;margin-left:0in;line-height:115%;margin-bottom:0in;margin-bottom:.0001pt;line-height:normal'&gt;All of the loans bear interest at 6% per annum.&amp;#160; The loans were made in 3 different currencies, Euros, Canadian Dollars and US Dollars.&amp;#160; All amounts reflected on these consolidated financial statements are expressed in US Dollars.&amp;#160; Repayment of the loans is due on closing of any future financing arrangement by the Company.&amp;#160; The balance of accrued interest of $237,314 and $215,518 is included in accounts payable and accrued expenses at June 30, 2013 and December 31, 2012, respectively.&amp;#160; Interest expense recognized on these loans was $24,167 for the six months ended June 30, 2013, compared to $23,418 for the six months ended June 30, 2012. &lt;/p&gt; &lt;p style='margin-top:0in;margin-right:0in;margin-bottom:10.0pt;margin-left:0in;line-height:115%;margin-bottom:0in;margin-bottom:.0001pt;line-height:normal'&gt;At June 30, 2013 and December 31, 2012 the Company had amounts due to related parties of $495,529 and $475,314, respectively.&amp;#160; &lt;/p&gt; &lt;p style='margin-top:0in;margin-right:0in;margin-bottom:10.0pt;margin-left:0in;line-height:115%;margin-bottom:0in;margin-bottom:.0001pt;line-height:normal'&gt;This amount includes $136,100 at June 30, 2013 and December 31, 2012, payable to two former directors and a current director for services rendered during 2007. This amount is to be paid part in cash and part in stock at a future date with the number of common shares determined by the fair value of the shares on the settlement date. The amounts owing bear no interest, are unsecured, and have no fixed terms of repayment.&lt;/p&gt;</NonNumbericText><FootnoteIndexer /><CurrencyCode /><CurrencySymbol /><IsIndependantCurrency>false</IsIndependantCurrency><ShowCurrencySymbol>false</ShowCurrencySymbol><DisplayDateInUSFormat>false</DisplayDateInUSFormat></Cell></Cells><ElementDataType>nonnum:textBlockItemType</ElementDataType><SimpleDataType>na</SimpleDataType><ElementDefenition>No authoritative reference available.</ElementDefenition><ElementReferences>No definition available.</ElementReferences><IsTotalLabel>false</IsTotalLabel><UnitID>0</UnitID><Label>3. Amounts Due To Related Parties and Loans Payable To Stockholders</Label></Row></Rows><Footnotes /><IsEquityReport>false</IsEquityReport><ReportName>3. Amounts Due To Related Parties and Loans Payable To Stockholders</ReportName><MonetaryRoundingLevel>UnKnown</MonetaryRoundingLevel><SharesRoundingLevel>UnKnown</SharesRoundingLevel><PerShareRoundingLevel>UnKnown</PerShareRoundingLevel><ExchangeRateRoundingLevel>UnKnown</ExchangeRateRoundingLevel><HasCustomUnits>true</HasCustomUnits><IsEmbedReport>false</IsEmbedReport><IsMultiCurrency>false</IsMultiCurrency><ReportType>Sheet</ReportType><RoleURI>http://arvana.com/20130630/role/idr_Disclosure3AmountsDueToRelatedPartiesAndLoansPayableToStockholders</RoleURI><NumberOfCols>1</NumberOfCols><NumberOfRows>2</NumberOfRows></InstanceReport>
