rlyons

What are the symptoms of a failing/failed lift pump? I don't have a fuel pressure gauge. My lift pump is a diaphragm type that I put on about 15 years ago. What I have is when pulling a load and climbing a hill the engine sort of cuts out kind of like a gas motor with a misfire. It's a slight jerking feeling but not a dead miss.

ofcmarc

When my LP gave up the ghost, the truck failed to start. Period. It died while I was at work. I drove there in the morning and that night when I went to start it to go home, no-bueno....

oliver foster

Take of the fuel line from the lift pump and use the thumb prime lever...does it pump fuel?

I would also check the oil level as when the LP goes out it can rip the diaphragm and dump lots of fuel into the oil pan....which is not good.

I would think 15 years is a decent service life, I would think a new LP might be in order.
I like the HVLP piston LP as an upgrade on my 1sr gen myself.

cougar

Put your foot to the floor. It should pull evenly all the way to the governor. If your pump is not supplying enough fuel you will notice the pull taper off before the governor. A piston lift pump is the best way to go. The Delphi pumps are excellent quality at a reasonable price and will handle mild performance mods with no problem.

rlyons

That's just what I had in mind, so I guess one of my Christmas presents to me will be the piston lift pump kit.

nothingbutdarts

Oliver,
Are you talking about the DELPHI HFP702 here??? If so, where to buy one? I see Jegs sells them but, was wondering if a sponsor her sells them?

oliver foster

I bought a few HVLP LP kits from The Hungry Diesel when he had a sale on them last year.
He includes the need line, two gaskets, spacer ETC that is needed to install it as part of the kit.
I have seen Diesel Tuff list them for sale as well.

KRB

That's exactly what mine did. Ran fine just tooling around but up a hill it would start missing and cutting out.

edwinsmith

Watch the pressure out of the new piston pump! Get one that the seller guarantees puts out about 15 psi and NO MORE! I got one off Amazon that put out 40 plus psi and it blew out the front seal of my VE injection pump and filled the crankcase with fuel. NOT a fun fix but I'm getting good at taking VE's off and on.

Edwin

rlyons

I ordered the kit from THD. It should be here in a week or so.

rlyons

Got my piston lift pump from THD and installed it yesterday. Now just need to get a load on it to see if it fixed the problem. Pretty simple to install, had to cut away a little insulation and tweak the line a little but not bad. Gonna put in some fuel and take it out tomorrow to see how it runs.

rlyons

The weather finally allowed me to get the truck out today and fuel it up. The new piston lift pump from THD fixed my problem and the truck is running great again. Before the install I was having trouble getting over 25psi boost, today a simple push on the throttle and it was burying the 30 pound gauge, idle is smooth as silk and a little higher. I am totally satisfied with the piston pump.

oliver foster

Great. I am glad you like the upgrade.
I know I was totally happy with the THD piston pump kit I installed on my '91.0 last winter. The other kit that was installed on my black crew cab has yet be fired up as I got caught up in the "while I am here" trap.
It is a great mod in a well priced and organized kit.

nascar mark

I guess you guys like paying more for the exact same kit I sell. Your $ but just saying.

oliver foster

Your right, it is my money and I can spend it anyway I want...Which is wisely.

I actually checked your site as well Mark, and with the sale THD was running, his kit was quite a bit cheaper than your kit, so I ordered 3 kits.

I try to do my research. I was in no rush for those parts so I was waiting for the best deal.

If he had not run the sale I would have bought from you Mark.