bad fuel pump symptoms?

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

quagmires_sho

Member
Joined
Aug 26, 2022
Messages
77
Reaction score
4
Location
PORTLAND, OR
i think maybe my fuel pump is going out, because car starts idles real good for about 3 seconds and then it feels like fuel gets cut to most of my cylinders and thats when the misfires start. it also SOUNDS like its going out, when car ran semi-normal it was already real loud so the car running poorly could've been enough to hold the pump on life support but the second i fixed the vacuum leak, it maybe was just too much stress and it shat the bed? idk what to think atp im definitely out of my element with this yamaha engine nonsense. it was getting most of the spark and ab 2/3 of the air itd usually get. i still need an ICM, so maybe the sudden change in air amount didnt give the computer time to relearn? this problem arose right around when the secondaries would stop opening n now its nearly inoperable. any help appreciated. tl;dr-my car runs bad (like 1-2 cylinders) and repair i made to vacuum system caused stress that the fuel pumps condition was NOT prepared to endure so now i think i need pump AND ICM
 

zoomlater

SHO Member
Supporting Member
Joined
May 31, 2004
Messages
3,423
Reaction score
1,723
Location
Seattle, WA
You can check the fuel pressure at the Schrader valve to see what pressure your fuel pump is putting out. Remove the cap on the valve, its in the middle of the intake, turn the key to on on position, but don't start it. Depress the valve and see if fuel comes out, you may want to put a rag over it as it can shoot straight up. If you have access to a fuel pressure gauge, you can screw that on and then check it that way. Fuel pressure is suppose to be around 30 to 35 psi
 

luigisho

SHO Member
Joined
Nov 2, 2001
Messages
12,752
Reaction score
4,707
Location
va beach,va
I don't understand this diagnosis.
This car is F'd up. Every system has to be looked at and see if it is operating within operational parameters. AIR, FUEL, SPARK, TIMING, SENSOR OPERATION, DC POWER
You can jump from one system to another but without a gameplan you will likely run in circles until you give up.

 
Last edited:

Forum statistics

Threads
105,580
Messages
1,164,877
Members
14,922
Latest member
RosieK76

Members online

Back
Top