The mechanical fuel pump is low pressure and is typically a diaphragm style pump (the inline Injection Pump's are fed by a piston style pump). 4-5psi is about it. Too much pressure and the front seal can be blown out of the Injection Pump and leak diesel fuel into the front gear cover which is oil bathed meaning you'll get fuel in your oil. The mechanical fuel pump is on the intake side of the engine. You can run an electric without a mechanical pump but make sure you've got it regulated down.
The best resource for cummins 4bt's is 4btswaps.com. EDIT: Looks like you've got a thread started over there.
There is great info there and the questions you are asking so far have all been answered. If you were sticking with a toyota diesel than this site's diesel section is the place to be but don't expect any love if you are asking cummins questions on a toyota diesel forum, it's just not the best place for info on these engines.
A 4bt does not need a computer, only one switched 12v to the cut off solenoid on the IP, and that's if you use the cut off solenoid. You can run it with out any juice if you use the shut down lever on the side of the IP (depending what IP shows up on your pump, this is assuming a Bocsh VE). As far as wiring you'll also have your sensors, alt, and starter to deal with but that's true with any engine.
I must have missed what your plans for your truck are since that will help you determine the kind of compromise you want to make. With mine, 4.10s on 37's with a .75 overdrive have been a good compromise for DD, wheeler, and towing. I cruise around 1900rpm at 65-70mph.
Overall I've enjoyed my little cummins. I'm turned up pushing about 180hp and close to 390tq. My goal is for 200hp/400tq and with some future mods planned I'll be beyond that. It's one hell of an engine and has taken some abuse. The vibs aren't really an issue as that depends on your mounting system, in fact the only real issue IMO is noise and there are ways to tune it to help that. It'll never be quite but for me the power far outweighs the noise negative. These engines are getting harder to find at a good price but it sound like you got a great deal as long as the IP works out. Good luck and enjoy the particulate.
The best resource for cummins 4bt's is 4btswaps.com. EDIT: Looks like you've got a thread started over there.
There is great info there and the questions you are asking so far have all been answered. If you were sticking with a toyota diesel than this site's diesel section is the place to be but don't expect any love if you are asking cummins questions on a toyota diesel forum, it's just not the best place for info on these engines.
A 4bt does not need a computer, only one switched 12v to the cut off solenoid on the IP, and that's if you use the cut off solenoid. You can run it with out any juice if you use the shut down lever on the side of the IP (depending what IP shows up on your pump, this is assuming a Bocsh VE). As far as wiring you'll also have your sensors, alt, and starter to deal with but that's true with any engine.
I must have missed what your plans for your truck are since that will help you determine the kind of compromise you want to make. With mine, 4.10s on 37's with a .75 overdrive have been a good compromise for DD, wheeler, and towing. I cruise around 1900rpm at 65-70mph.
Overall I've enjoyed my little cummins. I'm turned up pushing about 180hp and close to 390tq. My goal is for 200hp/400tq and with some future mods planned I'll be beyond that. It's one hell of an engine and has taken some abuse. The vibs aren't really an issue as that depends on your mounting system, in fact the only real issue IMO is noise and there are ways to tune it to help that. It'll never be quite but for me the power far outweighs the noise negative. These engines are getting harder to find at a good price but it sound like you got a great deal as long as the IP works out. Good luck and enjoy the particulate.
Last edited: