Quickfarms Posted May 21, 2019 Share Posted May 21, 2019 Based on the PAI catalog the correct lift pump should be ESP-3597, unfortunately this pump is NLA What pump can I use? What are my options? According to the PAI catalog ESP-3581 is only good up to 250hp Quote Link to comment Share on other sites More sharing options...
j hancock Posted May 21, 2019 Share Posted May 21, 2019 What year engine? Is a rebuild kit offered for your original? Quote JimIt doesn't cost anything to pay attention. Link to comment Share on other sites More sharing options...
fjh Posted May 21, 2019 Share Posted May 21, 2019 You need to be careful with these in some of the older older pumps the roller width is narrow if u get the wrong pump with the narrow roller and use it on a wide cam u can ruin the pump! I hesitate to make any comment other than that! 1 Quote Link to comment Share on other sites More sharing options...
Quickfarms Posted May 21, 2019 Author Share Posted May 21, 2019 1985 engine Quote Link to comment Share on other sites More sharing options...
fjh Posted May 21, 2019 Share Posted May 21, 2019 (edited) 38 minutes ago, Quickfarms said: 1985 engine Remove the pump measure the roller width and confirm with the vendor! would be my suggestion! the wide roller will work on the narrow cam but not the other way! The difference is may 1/6 of an inch how ever just enough to wreck stuff! Edited May 21, 2019 by fjh Quote Link to comment Share on other sites More sharing options...
j hancock Posted May 21, 2019 Share Posted May 21, 2019 OK. 1985 4 VH. Check with PAI and see what the specs are on their number ESP-3599. It is listed as a supply pump for the E6 4 valve head engines. Quote JimIt doesn't cost anything to pay attention. Link to comment Share on other sites More sharing options...
JoeH Posted May 22, 2019 Share Posted May 22, 2019 Can you delete the worn lift pump and install an electric lift pump? Make a cover plate for the old lift pump location? Quote Link to comment Share on other sites More sharing options...
Rob Posted May 22, 2019 Share Posted May 22, 2019 2 hours ago, JoeH said: Can you delete the worn lift pump and install an electric lift pump? Make a cover plate for the old lift pump location? Got to be careful there as an electric pump is not variable in flow. Seen it done a time or two and the engines flood, or overfuel at idle. 1 Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment Share on other sites More sharing options...
Quickfarms Posted May 27, 2019 Author Share Posted May 27, 2019 Since I was up in the Bay Area last week to attend my son's graduation from Berkeley and to bring both kids home from college I asked the parts house to send the pump out to see if it could be rebuilt. UDS a local shop that has rebuilt injectors and pumps for me in the past rebuilt the lift pump. This pump is noticeably bigger that the pump on the 235 Quote Link to comment Share on other sites More sharing options...
Mack Technician Posted May 27, 2019 Share Posted May 27, 2019 On 5/22/2019 at 8:11 AM, Rob said: Got to be careful there as an electric pump is not variable in flow. Seen it done a time or two and the engines flood, or overfuel at idle. Even as late as Vmac 2 they used a restricted orifice to attain fuel pressure. So yeah, flow sensitive. Quote Link to comment Share on other sites More sharing options...
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