macattack Posted July 21 Share Posted July 21 Got my 96 mavk with a e7 engine. Any advice on replacing the fuel supply pump. Pump has 2 lines and is mounted on the side of the injection pump and is secured by 3 bolts. Any advice is greatly appreciated Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/74366-lift-pump/ Share on other sites More sharing options...
terry Posted July 21 Share Posted July 21 Sounds like the lift pump with the plastic check valves, check them first. Terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74366-lift-pump/#findComment-555616 Share on other sites More sharing options...
terry Posted July 21 Share Posted July 21 A pic would help 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74366-lift-pump/#findComment-555617 Share on other sites More sharing options...
Joey Mack Posted July 21 Share Posted July 21 You got me curious Terry.. I think piston length is 'key' otherwise ,, easy swap.. Of course, I am very rusty on repairs that I have only done a few, and a long time ago.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/74366-lift-pump/#findComment-555637 Share on other sites More sharing options...
terry Posted July 21 Share Posted July 21 The lift pump I am thinking was on the older engines, E7 might be completely different.🤷♀️. Terry 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74366-lift-pump/#findComment-555643 Share on other sites More sharing options...
macattack Posted July 22 Author Share Posted July 22 (edited) Here is what it looks like. Its from ebay Thanks Edited July 22 by macattack Quote Link to comment https://www.bigmacktrucks.com/topic/74366-lift-pump/#findComment-555647 Share on other sites More sharing options...
terry Posted July 22 Share Posted July 22 Yeah that is a newer style, than I was thinking of. Terry Quote Link to comment https://www.bigmacktrucks.com/topic/74366-lift-pump/#findComment-555655 Share on other sites More sharing options...
macattack Posted July 22 Author Share Posted July 22 Do I have to worry about engine timing or just remove and replace? Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/74366-lift-pump/#findComment-555661 Share on other sites More sharing options...
Joey Mack Posted July 22 Share Posted July 22 R+R.. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74366-lift-pump/#findComment-555665 Share on other sites More sharing options...
macattack Posted July 22 Author Share Posted July 22 1 hour ago, Joey Mack said: R+R.. Thanks. Should make it easier. Quote Link to comment https://www.bigmacktrucks.com/topic/74366-lift-pump/#findComment-555674 Share on other sites More sharing options...
fjh Posted July 22 Share Posted July 22 4 minutes ago, macattack said: Thanks. Should make it easier. Got to ask! these are a rare fail ! Why are you replacing it? Quote Link to comment https://www.bigmacktrucks.com/topic/74366-lift-pump/#findComment-555676 Share on other sites More sharing options...
macattack Posted July 22 Author Share Posted July 22 Having starting issues. Checked for leaks and can't seem to find any. So thinking this may be the next to try. Quote Link to comment https://www.bigmacktrucks.com/topic/74366-lift-pump/#findComment-555681 Share on other sites More sharing options...
fjh Posted July 22 Share Posted July 22 1 hour ago, macattack said: Having starting issues. Checked for leaks and can't seem to find any. So thinking this may be the next to try. Have you checked the drain back tee at the end of the pump! Also the jumper between the heads ! Quite common for these return lines to cause start issues! Any of these plastic line can cause issues! Hate to see you throw money at an un needed pump! 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74366-lift-pump/#findComment-555685 Share on other sites More sharing options...
macattack Posted July 23 Author Share Posted July 23 Thanks I will check those. Is the drain back tee a check valve? Quote Link to comment https://www.bigmacktrucks.com/topic/74366-lift-pump/#findComment-555721 Share on other sites More sharing options...
fjh Posted July 23 Share Posted July 23 11 hours ago, macattack said: Thanks I will check those. Is the drain back tee a check valve? yes Quote Link to comment https://www.bigmacktrucks.com/topic/74366-lift-pump/#findComment-555731 Share on other sites More sharing options...
terry Posted July 23 Share Posted July 23 The slightest crack in a return line will let it bleed off, Terry Quote Link to comment https://www.bigmacktrucks.com/topic/74366-lift-pump/#findComment-555740 Share on other sites More sharing options...
macattack Posted July 24 Author Share Posted July 24 Thanks for all the replies. Gonna do some more investigating in the next couple days. Time is a issue right now. Quote Link to comment https://www.bigmacktrucks.com/topic/74366-lift-pump/#findComment-555797 Share on other sites More sharing options...
Solution macattack Posted August 5 Author Solution Share Posted August 5 Ok got a chance to take a look and noticed the line coming from the injection pump to the one side of the secondary fuel filter was cracked up. Replaced it and gonna give it a couple days to see if that fixed it. Will post if that cured things. Thanks 2 Quote Link to comment https://www.bigmacktrucks.com/topic/74366-lift-pump/#findComment-556454 Share on other sites More sharing options...
macattack Posted August 8 Author Share Posted August 8 (edited) Well changing that hose didn't fix it but no problem the hose needing replacing anyways. Took a closer look and found a cracked small plastic line. It was shot. It was connected to a banjo bolt with tees on the driver side of inj pump and went to a fitting on the passenger side.. I attached a couple pictures you can see the wear and cracks. Thanks everybody for the help Edited August 8 by macattack 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74366-lift-pump/#findComment-556720 Share on other sites More sharing options...
fjh Posted August 9 Share Posted August 9 5 hours ago, macattack said: Well changing that hose didn't fix it but no problem the hose needing replacing anyways. Took a closer look and found a cracked small plastic line. It was shot. It was connected to a banjo bolt with tees on the driver side of inj pump and went to a fitting on the passenger side.. I attached a couple pictures you can see the wear and cracks. Thanks everybody for the help All good bro happy for you ! cheaper than a pump !😎 Quote Link to comment https://www.bigmacktrucks.com/topic/74366-lift-pump/#findComment-556737 Share on other sites More sharing options...
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