nixpc Posted January 21, 2015 Share Posted January 21, 2015 Im having trouble with fuel leaks on my 98 E7 427 between the fuel pumps and the fuel manifold .Changed O rings and some still leak, any suggestions. Quote Link to comment https://www.bigmacktrucks.com/topic/38537-e7-427-fuel-pump-leaks/ Share on other sites More sharing options...
wheeler73 Posted January 22, 2015 Share Posted January 22, 2015 There is an updated delts seal kit for the unit pumps. Also the bolts must be tightned down evenly or the o-rings will get cut or nicked. Make sure the bores are clean and smooth. Always use new unit pump bolts with a little oil on the threads and torque to 60 ft lbs. Also make sure it is not leaking between the solenoid and the body of the unit pump. If it is there is a seal kit for that but it takes a special torks plus bit to remove the screws. Quote Link to comment https://www.bigmacktrucks.com/topic/38537-e7-427-fuel-pump-leaks/#findComment-275361 Share on other sites More sharing options...
felicello122 Posted January 22, 2015 Share Posted January 22, 2015 Ck the small fuel return line for leaks from rubbing or chafing Quote Link to comment https://www.bigmacktrucks.com/topic/38537-e7-427-fuel-pump-leaks/#findComment-275362 Share on other sites More sharing options...
Keffer inc Posted January 22, 2015 Share Posted January 22, 2015 Use new hardware for sure! A set of bolts broke off one of mine, probably last owner re used those bolts. $1,200 for towing and the shop to remove my turbo and extract what remained of thone two bolts. Quote Link to comment https://www.bigmacktrucks.com/topic/38537-e7-427-fuel-pump-leaks/#findComment-275412 Share on other sites More sharing options...
nixpc Posted January 24, 2015 Author Share Posted January 24, 2015 Thanks for the tips ! Quote Link to comment https://www.bigmacktrucks.com/topic/38537-e7-427-fuel-pump-leaks/#findComment-275681 Share on other sites More sharing options...
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