Underpsi

What are common signs that your lift pump is dead or failing?

robox

My girlfriend's lift pump gave no signs of it's impending death...

Just stopped working.

Left us by the side of the road. Had to tow her W250 with my W250.

Possibly related to biodiesel use, but that's not been proven.

CR

JD730

He's right ^^^

but they can die slowly too, common sign is hard start after sitting for a few hours after the lift pump lets fuel drain away from the pump. 230,000 miles when mine happened.

Underpsi

ok thanks guys

skchevota

Mine must have not been working for a week or so, It was hard to start in the mornings even when pluged in, If I did not plug it in forget it . I decided to check fuel flow and pulled the outlet line off , cranked it over and nothin..
In mine the check valve went bad not the diafram Put in a new one , all is happy now.

wannadiesel

Hard starting and a lack of power are the common symptoms. If you see fuel leaking out of it that's kind of a dead giveaway too.

Underpsi

So if your LP is gone you'll know something is wrong for sure then, as in the truck will run/start differently?

bgilbert

Go to www.genosgarage.com. Buy a pair of high flow banjo bolts, one tapped for 1/8npt. Get urself an el cheapo 0-30psi boost gauge with fittings. Install the banjo's in place of the restrictive oem banjos. Plumb the boost gauge into the tapped banjo. This is how you check fuel pressure. This can be done at idle, no need to make it a permanent setup in the cab. This is the way to determine if your lift pump is dead or more importantly weak. Your injection pump can pull its own fuel. The truck can and will run on its own with a dead lift pump. Then put the el cheapo boost gauge and fittings in the toolbox or cabinet and use it once a year or whenever to check/test lift pump pressure. Pipe plug in the tapped banjo.

Underpsi

I live in Canada So would they ship here? Or is there an easier way for me to get them?