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in tank fuel pump M275a2

johan77

Active member
136
47
28
Location
limburg belgium
Hi guys,
finally took out the fuel tank, drained it, took the pump out , cleaned the screens on the bottom, tested it in some diesel, it gives good and fast diesel.
the main reason i took the tank from under the truck was to check on my fuel pump, there was no fuse in it, so i always started without it, when 24 volts applied on the pump , directly on the fuse clamp, without fuse, the pump was running but no diesel was reaching even the primary filter so i assumed the rubber hose was broken .
the hose clamp was not tightend. i put all back together, did the test again and now it is starting from the fist push on the button, hot or cold, no matter what, it just starts very quick.
The main issue now is that when i put a fuse in it ( a 2amp fuse (i dont think its a slow blow) it blows within 5 seconds, when i combine the fuse with a tiny piece of electrical wire, the pump works a bit longer but the wire becomes very hot, in fact so hot the plastic insulation on the wire starts to melt, however i measure only between 1 and 1.8 amps on the + wire when running the pump. i seriously doubt that a slow blow fuse of 2 amps can take that.
what can be this issue ? the pump is wirring very fine, and smooth, when it stops it does not immediatly comes to a stop but keeps turning for some seconds so all is loose enough.
the pump is a tokheim model 558 24VDC.
 

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SETOYOTA

Well-known member
Steel Soldiers Supporter
2,407
450
83
Location
georgia
probably not your issue but I think the original fuse was a 2.5 amp. . I run 3s in my trucks
 

johan77

Active member
136
47
28
Location
limburg belgium
UPDATE !!!!!!

new pump installed.... correct fuse in it... no more problems
However... the old pump had the 24vlt wire directly on top, non removable... the new pump had a connector on the top side (push/turn) like the older model douglas connectors so i had to improvise... its working for now so i know the pump was the issue. It has to go one more time from under the truck when i find one of the connectors for the pump
 

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Paul.McLean.US

New member
10
11
3
Location
New York
Hi guys,
finally took out the fuel tank, drained it, took the pump out , cleaned the screens on the bottom, tested it in some diesel, it gives good and fast diesel.
the main reason i took the tank from under the truck was to check on my fuel pump, there was no fuse in it, so i always started without it, when 24 volts applied on the pump , directly on the fuse clamp, without fuse, the pump was running but no diesel was reaching even the primary filter so i assumed the rubber hose was broken .
the hose clamp was not tightend. i put all back together, did the test again and now it is starting from the fist push on the button, hot or cold, no matter what, it just starts very quick.
The main issue now is that when i put a fuse in it ( a 2amp fuse (i dont think its a slow blow) it blows within 5 seconds, when i combine the fuse with a tiny piece of electrical wire, the pump works a bit longer but the wire becomes very hot, in fact so hot the plastic insulation on the wire starts to melt, however i measure only between 1 and 1.8 amps on the + wire when running the pump. i seriously doubt that a slow blow fuse of 2 amps can take that.
what can be this issue ? the pump is wirring very fine, and smooth, when it stops it does not immediatly comes to a stop but keeps turning for some seconds so all is loose enough.
the pump is a tokheim model 558 24VDC.
Howdy, does that screen assembly just pull off? I took out the screws, I can twist it a bit, but I want to clean it up a bit.
 

johan77

Active member
136
47
28
Location
limburg belgium
Howdy, does that screen assembly just pull off? I took out the screws, I can twist it a bit, but I want to clean it up a bit.
Hi, yes, with the screws out you should be able to pull off the bottom part ( the part with the output line and the screen, and the magnetic disc or some sort sits also in that part...
 
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