It appears my lift pump is dead. I pulled the relay and jumpered the correct connectors, heard contacts click in, but no pump running. I'm on a budget (= low funding) and would like a decent quality unit that can bolt in, no huge modifications to my fuel system. Also, a recommended fuel pressure gauge installation set up would be appreciated.

Not bad... My first one failed at 45K miles and wiped out the VP44 at 50K miles...

Mine went 160k

I use an Isspro mechanical gauge. 0-30 psi is all you need. Love my unit. No problems with it.

[quote name='

But now increase the fuel pump to say 100 GPH and now do the math. 20 / 100 = 20% so that means 80% is being return under the heaviest load and plenty of cooling and lubrication is occuring.

But there is a hitch to this Now the lift pump has to be able to keep above 14 PSI at WOT to keep the cooling and lubricating going. Once you start dropping below 14 PSI the overflow valve on the return line start to close that means reduced cooling and lubrication so once the fuel pressure falls to 10 PSI the valve is closed and all extra cooling and lubrication is gone...[/quote']

That's why you're the GURU here!

GO CTD,

Dave

That's why you're the GURU here! GO CTD, Dave

Ummm... No I wouldn't go that far... I've sat down and learned from trial and error and from the other members too... Like this video I created because of ISX bugging me...

http-~~-//www.youtube.com/watch?v=YREpPrMxkHU

ISX must be a good bugger!

Well it proves the point that good fuel pressure equals good cooling and lubrication of the VP44... Below 14 it starts to get marginal... Below 10 your asking for VP44 failure...