Strange Fuel Starvation when its Cold Outside

[paladintrucks]

I have a severe Patrol Problem, My GQ Firetruck with 9,000 kms
2022-07-28 12.39.07.jpg

[paladintrucks]

Appreciate it!

[mudski]

Other than the fuel additive, go over every hose clamp, or better yet, replace every part of the fuel line, except the metal parts. Even though they look fine, they may not be. An being an old truck, regardless of use, those rubber lines are way out of service life.

[mihit]

Sounds maybe like air getting in the fuel lines somewhere. Before starting try cracking the bleed screw on the filter and hand priming. If it's bubbles then you've found the issue. It should be a solid stream of diesel.
Simplest is to fit an electric lift pump pre-filter. Which I do anyway as the stock IP is a) expensive and; b) a known failure point and; c) it makes bleeding the IP and injectors easy AF.

Another thing could be the gauze filter on top of the Injector pump, under the inlet. It's a sneaky bastard and AFAIK not mentioned in any manuals. Pull it out and check it's clear.

Other thing would be an injector service/replacement.

Nice collection man. Way straighter than mine! Have you thought about, y'know, using them? :P

[mihit]

Ahhhhhh. Is it one of the IPs with two solenoids on it? You have your main (lower) and -some- have a secondary right on top, which I'm pretty sure (never used it, always deleted) closes off the spill/return line, to boost pressure for cold starts.

I would hotwire or bypass the secondary, if that's the case.

[paladintrucks]

Ahhhhhh. Is it one of the IPs with two solenoids on it? You have your main (lower) and -some- have a secondary right on top, which I'm pretty sure (never used it, always deleted) closes off the spill/return line, to boost pressure for cold starts.

I would hotwire or bypass the secondary, if that's the case.

Stupid question, do i have a rotary or inline pump? Its a Blacktop TD42
Thanks
Sean

[mihit]

Stupid question, do i have a rotary or inline pump? Its a Blacktop TD42
Thanks
Sean

not sure on the terminology..."inline" I guess?

It's a gear driven wobble plate driving a plunger ...

[BrazilianY60]

not sure on the terminology..."inline" I guess?

The inline IP is like a mini 6 cilinder engine sitting besides the TD... all the pump pistons are inline, just like the engine is inline itself.

[BrazilianY60]

Stupid question, do i have a rotary or inline pump? Its a Blacktop TD42

You will have to look at it, or post a picture here if you wish.
The inline pump looks like a mini inline-6 engine. The steel fuel conduits go from the top of the pump to the engine injectors.
The rotary pump has the steel fuel conduits on the back of the pump, in a circular fashion. Looking at it it is easy to understand that it is a rotary action that pumps fuel into each conduit.

[mihit]

https://www.dieselduck.info/machine/...ion%20Pump.pdf