From 47772b9853cad2580dcc4dc665092fd660966ae5 Mon Sep 17 00:00:00 2001
From: david <david>
Date: Sat, 19 Jan 2002 18:25:52 +0000
Subject: [PATCH] Return a positive shortage when there is still fuel in the
 tank; otherwise, the logic in FGEngine::ConsumeFuel breaks down and the
 engine is starved when *any* feed tank is empty, rather than when all feed
 tanks are empty.

---
 src/FDM/JSBSim/FGTank.cpp | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/FDM/JSBSim/FGTank.cpp b/src/FDM/JSBSim/FGTank.cpp
index 55b7d09ec..9f77de5a1 100644
--- a/src/FDM/JSBSim/FGTank.cpp
+++ b/src/FDM/JSBSim/FGTank.cpp
@@ -95,19 +95,17 @@ FGTank::~FGTank()
 
 double FGTank::Reduce(double used)
 {
-  double shortage;
+  double shortage = Contents - used;
 
-  if (used < Contents) {
+  if (shortage >= 0) {
     Contents -= used;
     PctFull = 100.0*Contents/Capacity;
-    return 0.0;
   } else {
-    shortage = Contents - used;
     Contents = 0.0;
     PctFull = 0.0;
     Selected = false;
-    return shortage;
   }
+  return shortage;
 }
 
 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-- 
2.39.5