Another K30 with a 4bd1t... eventually.

9524 Views 134 Replies 19 Participants Last post by joshuak, 7 d ago

joshuak

Discussion Starter · Sep 3, 2020

2

Greetings folks,

Newbie here, both to the forum and to motors swaps. I wanted to start a thread to share a project I'm working on and hopefully get some pointers.

So, this:

In this:

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joshuak

Discussion Starter · #121 · 19 d ago (Edited)

3

Does some one have Isuzu spec for mechanical fuel pump pressure?

I’ve drawn a blank searching in the manuals I have and googlefu is weak.

Had a chance to go for a drive, fuel pressure was in 15-17 psi at idle and going down the road the first minute or so. Then fuel pressure dropped to 7 or so and endup at 0. Truck didn’t shut off though, ran poorly but ran.

Back in the driveway idling, it will surge between 0 and 7 psi it seems.

Decided to start at the back and pull it apart.

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Over here Russ asked about the in tank sock filter and I answered that I’d changed it 5 yrs ago with a new sending unit and tank. 5 yrs of little to no use is rough on this stuff, lol.

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Next is cleaning out tank and replacing sending unit, I’ll skip the filter sock this time. Let the others do their thing.

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Russ McLean

· #122 · 19 d ago

joshuak said:
Does some one have Isuzu spec for mechanical fuel pump pressure?

I’ve drawn a blank searching in the manuals I have and googlefu is weak.

Had a chance to go for a drive, fuel pressure was in 15-17 psi at idle and going down the road the first minute or so. Then fuel pressure dropped to 7 or so and endup at 0. Truck didn’t shut off though, ran poorly but ran.

Back in the driveway idling, it will surge between 0 and 7 psi it seems.

Decided to start at the back and pull it apart.

View attachment 135911

Over here Rus asked about the in tank sock filter and I answered that I’d changed it 5 yrs ago with a new sending unit and tank. 5 yrs of little to no use is rough on this stuff, lol.

View attachment 135912

View attachment 135913

Next is cleaning out tank and replacing sending unit, I’ll skip the filter sock this time. Let the others do their thing.

That filter sock is plugged up - The fuel is not draining out.

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joshuak

Discussion Starter · #123 · 18 d ago (Edited)

3

Drained and cleaned the tank with a a couple rags on a rod, inspected as best I could with a flashlight. Then cleaned up the sending unit I have and reinstalled it without the filter sock, new unit was either more than I wanted to spend or a week out. New fuel filter too of course.

New fuel left, old fuel right.

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Russ seems to have nailed the diagnosis of my troubles 7 months ago and was kind enough to point it out again yesterday. Wasn’t original to the truck, but was plugged up.

Quoting previous post for truth!

Russ McLean said:
I have not re-read your previous posts. Question: Do you have the original fuel sock on the fuel pickup tube? Diesel fuel is known to plug-up thes gasoline fuel socks.

Without the fuel sock, with fresh fuel and filter I got fuel pressure back and it maintained around 12-17psi throughout a 20 min drive.

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And I only know what’s happening because I’m following a suggestion to add a fuel pressure gauge from Levis.

So, thank you very much for the help gentleman, Much appreciated.

Hoping to go to the DMV for plates tomorrow, now that I think I can make it. Not one to tempt fate, but today I rolled through the spot I mentioned earlier in thread I had had to pull over twice at. Felt good.

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joshuak

Discussion Starter · #124 · 17 d ago

4

Pulled into the parking lot at work this morning and saw dripping from the front axle, popped the hood and realized fuel was squirting around on the passenger side. Shut the truck down and layed down some absorbent pads.

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Found a broken fuel return line right at the banjo bolt on the IP.

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This got me home.

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And I added one of these, eventually I’ll replace it with a more inconspicuous one. But for now it gave me peace of mind lol.

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Dougal

· #125 · 17 d ago

That's a weird failure. Was the line bent or stretched?

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joshuak

Discussion Starter · #126 · 17 d ago (Edited)

There was no indication of either of those. Nothing whipped around there or is loose.

It looked to me like the brazing failed/snapped at the connection with the banjo bolt because it was flush. Edit! Tube after, because braze/weld is intact.

Full disclosure: this evening I added two of the three fasteners that hold the fuel filter mount because they were missing. It was held in place loosely by the nut on the green stud. In hindsight, if the return line connection was providing structural support to the filter and housing, vibration could have contributed to failure (?).

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SUBRUTUS

· #127 · 17 d ago

joshuak said:
Pulled into the parking lot at work this morning and saw dripping from the front axle, popped the hood and realized fuel was squirting around on the passenger side. Shut the truck down and layed down some absorbent pads.

View attachment 135925

Found a broken fuel return line right at the banjo bolt on the IP.

View attachment 135928

This got me home.

View attachment 135927

And I added one of these, eventually I’ll replace it with a more inconspicuous one. But for now it gave me peace of mind lol.

View attachment 135929

To prevent that from happening again, find a shop that can fabricate braided lines w/banjo ends, they flex, hard line don't and when over torked they crack...yes, its a well known issue.

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boomersrule55

· #128 · 15 d ago

joshuak said:
Got my replacement motor mount, confirmed the mount on the PS has dropped 3/4”. New motor mount has visible flaws in the rubber. Better than what’s installed currently but for how long?

View attachment 135789

I’ve exchanged a couple emails with folks from Parker Lord, really hoping for something else similar. Going OEM with solid rubber is always an option. We’ll see, said the blind man.

A little late here, but I found a supplier that sells the oe bread van mounts; Mill Supply, Inc. is how they show their business name, sorry don't have a link, they may or may not be better than the anchor mounts, they do have two mounting studs on the bottom though...

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Russ McLean

· #129 · 15 d ago

Stepvan Engine & Transmission Mounts | Mill Supply, Inc.

Stepvan Engine & Transmission Mounts available at low prices! We have a huge selection of high quality stepvan, walkin van, and food truck parts including brakes, exhaust, fuel tanks, lights, roll up door parts, and more! Get your Stepvan Engine & Transmission Mounts today! Most orders shipped...

www.millsupply.com

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joshuak

Discussion Starter · #130 · 15 d ago

boomersrule55 said:
A little late here, but I found a supplier that sells the oe bread van mounts; Mill Supply, Inc. is how they show their business name, sorry don't have a link, they may or may not be better than the anchor mounts, they do have two mounting studs on the bottom though...

Thank you, Not late at all. I will reach out to them and ask if they’re happy with the quality of their current supplier. Current mounts have two studs on the bottom too!

A representative from Parker Lord found something similar, but I would need to reconfigure the frame side mounts a little at bit and at 140$ a piece I’d rather stick with the current setup.

Russ McLean said:
Stepvan Engine & Transmission Mounts | Mill Supply, Inc.

Stepvan Engine & Transmission Mounts available at low prices! We have a huge selection of high quality stepvan, walkin van, and food truck parts including brakes, exhaust, fuel tanks, lights, roll up door parts, and more! Get your Stepvan Engine & Transmission Mounts today! Most orders shipped...

www.millsupply.com

Thank you! Looks like SKU # 87-133 is them.

joshuak

Discussion Starter · #131 · 15 d ago

3

Fuel pressure sensor continues to pay dividends, today it alerted me to another obstruction. Screen at banjo bolt feeding the mechanical pump this time.

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Cleaned and reassembled, then put a new fuel filter on too, cheap insurance I guess.

In a few weeks I’d to add a Racor 460-30 or similar between the tank and mechanical pump.

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joshuak

Discussion Starter · #132 · 15 d ago (Edited)

Data on air intake snorkel measured by vacuum, in of h20, Pre filter / Post filter

with Donaldson topspin 18/18.
snorkel only 10/13.
No snorkel Less than 10/10.

I put the snorkel on hoping to get fresh air to the engine, but the juice doesn’t seem worth the squeeze.

And with no snorkel (it seemed to me) there was less boost lag, allowing it to catch the egts before they got out of control (above 1200).

Thinking about a simple intake box under the hood like most pickup trucks have nowadays.

cliffpoint

· #133 · 15 d ago

joshuak said:
Data on air intake snorkel measured by vacuum, in of h20, Pre filter / Post filter

with Donaldson topspin 18/18.
snorkel only 10/13.
No snorkel Less than 10/10.

I put the snorkel on hoping to get fresh air to the engine, but the juice doesn’t seem worth the squeeze.

And with no snorkel (it seemed to me) there was less boost lag, allowing it to catch the egts before they got out of control (above 1200).

Thinking about a simple intake box under the hood like most pickup trucks have nowadays.

that is a dirty system, unfortunately, its everywhere !

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joshuak

Discussion Starter · #134 · 14 d ago

cliffpoint said:
that is a dirty system, unfortunately, its everywhere !

Its crazy how much has accumulated from inactivity, I guess. In 2018, I had that tank clean inside and out. New rubber lines and replaced existing metal lines with CuNi. Installed on truck and had about 3/4 tank of fuel that I’d drained and replaced a few times, until this past week detailed in previous post.

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Whatever, I’ll get there!

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joshuak

Discussion Starter · #135 · 7 d ago (Edited)

2

Did one of of my favorite modifications to the truck this weekend, added about 100 miles to the odometer!

So far so good, continue to monitor fuel pressure. Haven’t found anything published by Isuzu, but I did find a couple posts here on the forum.

One from bush67 (with tech) and a another from Benjaminearl (with his experience).
What I’m seeing is similar to benjaminearl’s numbers minus the 30psi of boost.

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