aanderson Posted March 30, 2012 Share Posted March 30, 2012 i have have a 86 r model with a 300 engine. The engine always had a surging issue and recently has gotten worse. It also losses power on a extended hard pull. I believe the supply fuel pump may be getting weak. It has Pai 3597 on the pump. Are there rebuild kits availiable for this pump? i heard that it is somewhat common for these engines to surge. I bled the fuel system buy pumping air into the fuel tank with the feed line to the injection pump off. It pushed fuel backwards out of the injection pump as well as pushing it out the feed line. I think it shouldnt have pushed fuel out the injection pump but not sure. Thanks in advance for any help on this problem Andy Quote Link to comment https://www.bigmacktrucks.com/topic/24185-engine-surges-and-loss-of-power/ Share on other sites More sharing options...
smokin joe Posted March 30, 2012 Share Posted March 30, 2012 What I found with my dump with the 300 in it was it indeed was the injector pump. it was about as cheap to purchase an exchange and I went ahead while into it and got a 350 pump and got quite a bit more pep out of the truck. Quote Link to comment https://www.bigmacktrucks.com/topic/24185-engine-surges-and-loss-of-power/#findComment-111048 Share on other sites More sharing options...
slpwlker Posted March 30, 2012 Share Posted March 30, 2012 Welcome to the Jungle Quote Link to comment https://www.bigmacktrucks.com/topic/24185-engine-surges-and-loss-of-power/#findComment-111054 Share on other sites More sharing options...
Olivetroad Posted March 30, 2012 Share Posted March 30, 2012 Double welcome since you are from the show-me state! Quote Link to comment https://www.bigmacktrucks.com/topic/24185-engine-surges-and-loss-of-power/#findComment-111111 Share on other sites More sharing options...
motortrans Posted April 8, 2012 Share Posted April 8, 2012 Could be as simple as the fuel caps arn't venting like they should. When it is sluggish, take the caps off and see if there is a difference. Good Luck!!! Quote Link to comment https://www.bigmacktrucks.com/topic/24185-engine-surges-and-loss-of-power/#findComment-113278 Share on other sites More sharing options...
Cruiseliner Posted April 8, 2012 Share Posted April 8, 2012 Hi,We had a R600 with a similar problem and we changed the lift pump, cleaned the tank vent. All made no difference. We found that the elbow on the fuel tank was half blocked, cleaned it now goes like a rocket. Might be worth a look. Quote Link to comment https://www.bigmacktrucks.com/topic/24185-engine-surges-and-loss-of-power/#findComment-113302 Share on other sites More sharing options...
aanderson Posted April 15, 2012 Author Share Posted April 15, 2012 thanks for the info The truck is back to running great. It had broken spring in the return line and had trash in the tank. Quote Link to comment https://www.bigmacktrucks.com/topic/24185-engine-surges-and-loss-of-power/#findComment-114453 Share on other sites More sharing options...
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