Gear marks on 4jA1 isuzu 250 - Isuzu Cars & Trucks

One has to check the fuse for Instruments. When it failed you check any cable for wear marks and the chance it shorted out against some ground. Next the main plugs for power to be in good condition and not being corroded. Sometimes the cables break where they are clamped on a cable lug and one can then easily pull them out of a connector. It can be a bad connection to ground, where ground cables connect to a larger wire. Ignition switches can fail and have connections for many functions with plugs down below. It should be any of these causes.

Question edited for clarity and add maker.
Question moved to maker category.

So the pump wasn't new? Perhaps it was broken?

Air locks in the system?

Help in the link

https://www.google.com/search?q=Isuzu+kb+250+4ja1+stalls+while+idling

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It is here

https://www.ebay.com/itm/313409718567

https://www.google.com/search?q=isuzu+4ja1+parts+catalog+pdf

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try here

https://workshop-manuals.com/isuzu/

welcome to our USA forum, the country with no KB trucks here.
not a single one, nor a book to match.
zero.
use search, this is asked like 10,000 times here,
and zero to very few answer, if correct at all.
you need a KB book, we do not have one, state side.
google , 4JA1 cam timing, good luck , lots of false hits.
if go to African, Isuzu and buy the book.
be best.

what car? and model or truck....all that, is how data is INDEXED
what year?
what country.?
4ja what.
4ja1
4ja1-L
4Ja1-T
please !

https://www.manualslib.com/manual/1208071/Isuzu-A-4ja1.html?page=26 tells you what the settings are and how to adjust them!

Freek Rohrbeck wants answers to this question
are so lazy you cant start your own post?
1: no country stated.
2: no year (1990?)
3: no engine, (freeks engine) not ANON. 2.5 Diesel.?
4: we dont have PUMO in usa, so where are you?
5: timing a cam, or timing a fuel pump, how can we guess that?

ahhhhhh PUMO is PUMP ????? wow. prefect place for a typo..

its no USA "pickup" at all.
2.5 L 4JA1-T
is this your true engine name
if yes, google it and find free facts (or endless lies)
there is turbo , non turbo and twin turbo, on newer cars)

here we can google all day

https://duckduckgo.com/?q=4ja1+fuel+pump+timing&ia=web

AFAIK, isuzu 4JA1 has no timing belt. it is a gear drive timing system.